Need to bump this, as last.fm is fairly important feature to me.
A little more on my particular problem. I installed 14 (purchased last weekend as upgrade), while 13 was still installed. After using 14 for a day or two without any issue (didn't actually check last.fm at the time), I uninstalled 13.
Here is a screenshot of what happens if I click on the last.fm plugin under Services & Plug-ins:
Here is a screenshot of the plug-in mananger:
Here is the system info:
Media Center 14.0.121 Registered -- C:\Program Files\J River\Media Center 14\
Microsoft Windows XP Workstation 5.1 Service Pack 3 (Build 2600)
AMD Athlon 2081 MHz MMX / Memory: Total - 1506 MB, Free - 843 MB
Internet Explorer: 8.0.6001.18702 / ComCtl32.dll: 5.82.2900 / Shlwapi.dll: 6.0.2900 / Shell32.dll: 6.0.2900 / wnaspi32.dll: N/A
Ripping / No CD drives found.
Digital playback: Yes / Get cover art: Yes / Calc replay gain: Yes / Copy volume: 32767
Eject after ripping: Yes / Play sound after ripping: No
Burning / No burners found.
Test mode: No / Eject after writing: No / Direct decoding: No / Write CD-Text: No
Use playback settings: No /
Portable Device Info
Removed devices:
Interface Plugins:
last.fm (Active)
Library Server (Active)
TiVo Server (Active)
UPnP Server (Active/Enabled)