OK, that's quite a bit more information.
I can confirm that, for example...
http://yp.shoutcast.com/sbin/tunein-station.pls?id=213510 from
http://www.shoutcast.com/Internet-Radio/Real%20Radio%20XS... doesn't seem to work on Windows 7. MC simply hangs when I try to play it. It is an AAC+ stream.
The same URL and PLS file (if saved to a local drive) work fine on XP.
To JRiver: Here is the tail of a previous log if it helps anything.
...
0058078: 3984: Database: CMediaDatabase::AddFile: JRAnalyzer: 0x524f930
0058078: 3984: Database: CMediaDatabase::AddFile: Calling JRAnalyzer::Open
0058078: 3984: Import: JRAnalyzer::Open: Start
0058078: 3984: Import: JRAnalyzer::AddFile: Start
0058078: 3984: Import: JRAnalyzer::AddFile: Filename: C:\Users\AB\Desktop\Real Radio XS.pls
0058078: 3984: Import: CPlaylistExpander::ExpandFilePlaylist: Start
0058078: 3984: Import: JRAnalyzer::DownloadOrReadFile: Start
0058188: 3984: Import: JRAnalyzer::DownloadOrReadFile: Finish (110 ms)
0058188: 3984: Reader: CInternetReader::Open: Start
0058188: 3984: Reader: CInternetReader::Open: Opening http://194.50.90.18:10103
0058188: 3616: Reader: CInternetReader::Thread: Start
0058188: 3616: Reader: CInternetReader::Connect: Start
0058203: 3616: Reader: CInternetReader::Connect: Finish (15 ms)
0058203: 3616: Reader: CInternetReader::DownloadFromHTTPURL: Start
0060469: 3616: Reader: CInternetReader::DownloadFromHTTPURL: Success
0060469: 3616: Reader: CInternetReader::DownloadFromHTTPURL: Finish (2266 ms)
0060469: 3616: Reader: CInternetReader::Thread: Finish (2281 ms)
0060469: 3984: Reader: CInternetReader::Open: Finish (2281 ms)
0060469: 3984: Reader: CInternetReader::Close: Start
0060485: 3984: Reader: CInternetReader::Close: Finish (16 ms)
0060485: 3984: Reader: CInternetReader::Open: Start
0060485: 3984: Reader: CInternetReader::Open: Opening http://194.50.90.55:10103
0060485: 728: Reader: CInternetReader::Thread: Start
0060485: 728: Reader: CInternetReader::Connect: Start
0060485: 728: Reader: CInternetReader::Connect: Finish (0 ms)
0060485: 728: Reader: CInternetReader::DownloadFromHTTPURL: Start
0060641: 728: Reader: CInternetReader::DownloadFromHTTPURL: Success
0060641: 728: Reader: CInternetReader::DownloadFromHTTPURL: Finish (156 ms)
0060641: 728: Reader: CInternetReader::Thread: Finish (156 ms)
0060641: 3984: Reader: CInternetReader::Open: Finish (156 ms)
0060641: 3984: Reader: CInternetReader::Close: Start
0060641: 3984: Reader: CInternetReader::Close: Finish (0 ms)
0060641: 3984: Import: CPlaylistExpander::ExpandFilePlaylist: Finish (2563 ms)
0060641: 3984: Import: JRAnalyzer::AddFile: Start
0060641: 3984: Import: JRAnalyzer::AddFile: Filename: http://194.50.90.18:10103
0060641: 3984: Import: JRAnalyzer::AddFileMJ: Start
0060641: 3984: Import: JRAnalyzer::AddFileMJ: Finish (0 ms)
0060641: 3984: Import: JRAnalyzer::AddFile: Finish (0 ms)
0060641: 3984: Import: JRAnalyzer::AddFile: Start
0060641: 3984: Import: JRAnalyzer::AddFile: Filename: http://194.50.90.55:10103
0060641: 3984: Import: JRAnalyzer::AddFileMJ: Start
0060641: 3984: Import: JRAnalyzer::AddFileMJ: Finish (0 ms)
0060641: 3984: Import: JRAnalyzer::AddFile: Finish (0 ms)
0060641: 3984: Import: JRAnalyzer::AddFile: Finish (2563 ms)
0060641: 3984: Import: JRAnalyzer::Open: Finish (2563 ms)
0060641: 3984: Database: CMediaDatabase::AddFile: JRAnalyzer::Open returned
0060641: 3984: Database: JRAnalyzerFile::GetImage: Start
0060641: 3984: Reader: CInternetReader::Open: Start
0060641: 3984: Reader: CInternetReader::Open: Opening http://194.50.90.18:10103
0060656: 3472: Reader: CInternetReader::Thread: Start
0060656: 3472: Reader: CInternetReader::Connect: Start
0060656: 3472: Reader: CInternetReader::Connect: Finish (0 ms)
0060656: 3472: Reader: CInternetReader::DownloadFromHTTPURL: Start
0060813: 3472: Reader: CInternetReader::DownloadFromHTTPURL: Success
0060813: 3472: Reader: CInternetReader::DownloadFromHTTPURL: Finish (157 ms)
0060813: 3472: Reader: CInternetReader::Thread: Finish (157 ms)
0060813: 3984: Reader: CInternetReader::Open: Finish (172 ms)
0086906: 2228: Playback: CPlayerZone::DLNADeviceSubscription_PropertyChanged: Start
0086906: 2228: Playback: CPlayerZone::DLNADeviceSubscription_PropertyChanged: State changing from 1 to 2
0086906: 2228: Playback: CPlayerZone::DLNADeviceSubscription_PropertyChanged: Finish (0 ms)
0086938: 2796: Playback: CPlayerZone::DLNADeviceSubscription_PropertyChanged: Start
0086938: 2796: Playback: CPlayerZone::DLNADeviceSubscription_PropertyChanged: State changing from 2 to 3
0086938: 2796: Playback: CPlayerZone::DLNADeviceSubscription_PropertyChanged: Finish (0 ms)
0087438: 2280: Playback: CPlayerZone::DLNADeviceSubscription_PropertyChanged: Start
0087438: 2280: Playback: CPlayerZone::DLNADeviceSubscription_PropertyChanged: State changing from 3 to 2
0087438: 2280: Playback: CPlayerZone::DLNADeviceSubscription_PropertyChanged: Finish (0 ms)
0269938: 2404: Reader: CInternetReader::Open: Start
0269938: 2404: Reader: CInternetReader::Open: Opening http://192.168.253.1:1900/igd.xml
0269953: 4076: Reader: CInternetReader::Thread: Start
0269953: 4076: Reader: CInternetReader::Connect: Start
0269953: 4076: Reader: CInternetReader::Connect: Finish (0 ms)
0269953: 4076: Reader: CInternetReader::DownloadFromHTTPURL: Start
0269953: 4076: Reader: CInternetReader::DownloadFromHTTPURL: Failed (header status code: 500)
0269953: 4076: Reader: CInternetReader::DownloadFromHTTPURL: Finish (0 ms)
0269953: 4076: Reader: CInternetReader::Thread: Finish (0 ms)
0269953: 2404: Reader: CInternetReader::Open: ConnectToURL failed, m_bConnectError=TRUE, URL=http://192.168.253.1:1900/igd.xml
0269953: 2404: Reader: CInternetReader::Close: Start
0269953: 2404: Reader: CInternetReader::Close: Finish (0 ms)
0269953: 2404: Reader: CInternetReader::Open: Finish (15 ms)
0397250: 2320: Reader: CInternetReader::Open: Start
0397250: 2320: Reader: CInternetReader::Open: Opening http://192.168.253.21:52109/eventSub
0397250: 2064: Reader: CInternetReader::Thread: Start
0397250: 2064: Reader: CInternetReader::Connect: Start
0397250: 2064: Reader: CInternetReader::Connect: Finish (0 ms)
0397250: 2064: Reader: CInternetReader::DownloadFromHTTPURL: Start
0397266: 2064: Reader: CInternetReader::DownloadFromHTTPURL: Success
0397266: 2064: Reader: CInternetReader::DownloadFromHTTPURL: Finish (16 ms)
0397266: 2064: Reader: CInternetReader::Thread: Finish (16 ms)
0397266: 2320: Reader: CInternetReader::Open: Finish (16 ms)
0397266: 2320: Reader: CInternetReader::Read: InternetReadFile returned true with zero bytes read: EOF
0397266: 2320: Reader: CInternetReader::Close: Start
0397266: 2320: Reader: CInternetReader::Close: Finish (0 ms)
0584953: 3220: Reader: CInternetReader::Open: Start
0584953: 3220: Reader: CInternetReader::Open: Opening http://192.168.253.1:1900/igd.xml
0584953: 2764: Reader: CInternetReader::Thread: Start
0584953: 2764: Reader: CInternetReader::Connect: Start
0584953: 2764: Reader: CInternetReader::Connect: Finish (0 ms)
0584953: 2764: Reader: CInternetReader::DownloadFromHTTPURL: Start
0584969: 2764: Reader: CInternetReader::DownloadFromHTTPURL: Failed (header status code: 500)
0584969: 2764: Reader: CInternetReader::DownloadFromHTTPURL: Finish (16 ms)
0584969: 2764: Reader: CInternetReader::Thread: Finish (16 ms)
0584969: 3220: Reader: CInternetReader::Open: ConnectToURL failed, m_bConnectError=TRUE, URL=http://192.168.253.1:1900/igd.xml
0584969: 3220: Reader: CInternetReader::Close: Start
0584969: 3220: Reader: CInternetReader::Close: Finish (0 ms)
0584969: 3220: Reader: CInternetReader::Open: Finish (16 ms)
0899969: 940: Reader: CInternetReader::Open: Start
0899969: 940: Reader: CInternetReader::Open: Opening http://192.168.253.1:1900/igd.xml
0899969: 2800: Reader: CInternetReader::Thread: Start
0899969: 2800: Reader: CInternetReader::Connect: Start
0899969: 2800: Reader: CInternetReader::Connect: Finish (0 ms)
0899969: 2800: Reader: CInternetReader::DownloadFromHTTPURL: Start
0899985: 2800: Reader: CInternetReader::DownloadFromHTTPURL: Failed (header status code: 500)
0899985: 2800: Reader: CInternetReader::DownloadFromHTTPURL: Finish (16 ms)
0899985: 2800: Reader: CInternetReader::Thread: Finish (16 ms)
0899985: 940: Reader: CInternetReader::Open: ConnectToURL failed, m_bConnectError=TRUE, URL=http://192.168.253.1:1900/igd.xml
0899985: 940: Reader: CInternetReader::Close: Start
0899985: 940: Reader: CInternetReader::Close: Finish (0 ms)
0899985: 940: Reader: CInternetReader::Open: Finish (16 ms)