If you haven't given up and done it manually, you can save your settings by manually "hacking" the registry, if you're feeling brave. I should stress before I even say this... This could completely hose your computer if you don't do it right. Not for the feint of heart!!
Ok, disclosure finished. MC saves most of it's non-library specific settings in the Registry under the HKEY_CURRENT_USER\Software\JRiver\Media Center 12 (for v12). What you'll want to do is copy the registry keys from the HKEY_CURRENT_USER\Software\JRiver\Media Center 11 subkeys to the keys for v12. This isn't too hard to do.
Before you start, backup your current v12 registry key so that you can restore it if something goes wrong. Open the registry editor and navigate to: HKEY_CURRENT_USER\Software\JRiver\Media Center 12. Right click on it in the tree and choose Export. Save the REG file somewhere safe.
Then, navigate to: HKEY_CURRENT_USER\Software\JRiver\Media Center 11. Right click on that key and choose Export. Save the REG file somewhere you can find it.
Open the v11 REG file up using Notepad or some other Text editor. I use Crimson Editor because it's awesome, but notepad will work just as well. Then do a find and replace on the file using these terms:
Find: Media Center 11
Replace: Media Center 12
I'd do them one at a time, rather than Replace All. As you're going through, what you want to do is find all the stuff like this:
[HKEY_CURRENT_USER\Software\JRiver\Media Center 11\File Conversion]
And turn it into this:
[HKEY_CURRENT_USER\Software\JRiver\Media Center 12\File Conversion]
The next thing I'd do is delete out all the stuff that you really don't need to save from v11. That way, you're a lot less likely to mess up your v12 install. You'll want to delete the keys like:
[HKEY_CURRENT_USER\Software\JRiver\Media Center 12\Burning]
[HKEY_CURRENT_USER\Software\JRiver\Media Center 12\CD Reader]
[HKEY_CURRENT_USER\Software\JRiver\Media Center 12\Installer]
When you're deleting a key, you have to delete all the subkey info as well. So, delete the whole block like:
[HKEY_CURRENT_USER\Software\JRiver\Media Center 12\TV Settings]
"Country Name"="United States of America"
"Country Code"=dword:00000001
"TV Tuner Input Type"=dword:00000001
"VideoDevice"=dword:00000000
"AudioDevice"=dword:00000000
"VideoDeviceDisplayName"="@device:pnp:\\\\?\\display#ntativrv40#5&22df264f&0&80000008&04&00#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\\global"
"DVideoDeviceDisplayName"=""
"AudioDeviceDisplayName"="@device:cm:{33D9A762-90C8-11D0-BD43-00A0C911CE86}\\Realtek HD Audio input"
"UseFrameRate"=dword:00000001
"UseTimeLimit"=dword:00000001
"TimeLimit"=dword:00002a30
"MasterStream"=dword:00000001
"Capture File"="M:\\Temp\\TempCaptureFile.AVI"
"Last Channel"=dword:00000003
"TVSizeHeight"=dword:000000a1
"TVSizeWidth"=dword:000000d7
"Closed Caption"=dword:00000000
"Capture Closed Caption To File"=dword:00000000
"Compressor"=dword:00000003
"Use Overlay Mode"=dword:00000001
"Want Preview"=dword:00000001
"Audio Line"="Line In"
"Mixer Device"="NVIDIA(R) nForce(TM) Audio"
"Video Input Selection"=dword:00000002
"Video Position X"=dword:00000000
"Video Position Y"=dword:00000000
"Crop Edges (1)"=dword:00000000
"WinTV Driver Type"=dword:ffffffff
"Use Deinterlace Filter"=dword:00000000
"Has Physical Audio Connection To Sound Card"=dword:00000001
"Keep Aspect Ratio"=dword:00000001
"Aspect Ratio"=dword:00030004
"Audio Mode"=dword:00000012
"Enable Audio Mode Selection"=dword:00000001
"TV Standard"=dword:00000001
"Recording Profile"="640 x 240 JRiver Codec Timeshift, WMV Recording, 29.97"
"Enable Still Picture Capture"=dword:00000000
"Color Space Capabilities"=dword:00000003
"VideoProcAmpProperties"=hex:80,00,00,00,00,00,00,00,80,00,00,00,00,00,00,00,\
80,00,00,00,00,00,00,00,80,00,00,00,00,00,00,00,c8,00,00,00,00,00,00,00,00,\
00,00,00,02,00,00,00,00,00,00,00,02,00,00,00,00,00,00,00,02,00,00,00,00,00,\
00,00,02,00,00,00,00,00,00,00,68,5c,61,02
"Auto Import Recorded"=dword:00000001
And keep the ones like:
[HKEY_CURRENT_USER\Software\JRiver\Media Center 12\MCBars\Bottom]
[HKEY_CURRENT_USER\Software\JRiver\Media Center 12\Player Core]
[HKEY_CURRENT_USER\Software\JRiver\Media Center 12\Plugins\DSP\MJ DSP\EQ Presets]
[HKEY_CURRENT_USER\Software\JRiver\Media Center 12\Properties]
Then, when you're all done, save it and double click on the REG file (make sure MC12 is closed). It'll ask you if you're sure. Say yes and then re-open MC12. If it crashes, then you did something wrong and restore your REG backup that you made in step 1.