FLAC playback troubles with 7MC x64

I've got Win7 RC1 x64 up and running, and last night I installed the Shark007 codec packs (both x86 and x64 packs) before ever opening Media Center. After installation nad restart, I checked to make sure my flac files played properly in Media Player, which they did. After I started Media Center and added all the files to my library, I tried playing a few flac-based playlists and got an error message that "the files could not be found in the proper location." When I tried to play individual files it told me it was unable to open them.

Any ideas why this might be going on? Any particular settings I should look to set/change in the Shark007 settings? Thanks in advance for the help.

If there is no 64-but flac codec included in the shark pack, why am I able to play them without a problem in WMP? Is it using the 32-bit version of that but not WMC? I know Windows 7 comes with both 32- and 64-bit versions of both programs, but how do I know which one it is using by default? Like I said, I'm able to play flac with no issues in Media Player, but as soon as I open up Media Center and try to do it, I get errors.

After some additional messing around, I've discovered that media center will play flac files and playlists just fine IF media player is open in the background. However, as soon as media player is closed, media center gives error messages stating that the files can not be found. Additionally, every time I choose a different playlist with both open, media player will pop up a window (which I don't see until I minimize/close media center) asking if I want to save the changes made to the most current playlist.

I can't for the life of me figure out why these two programs are interacting like this and why I can play FLAC in media center with media player open, but not without. Is anyone else experiencing or able to duplicate this issue? If anyone can provide insight I'd appreciate it!

I've got no problem tweaking/disabling codecs and filters, as this is a non-critical partition, so I can always wipe it and start over if I cripple something. With that in mind, you would be willing to provide a bit more guidance on what you're referring to? i.e., which other codecs/filters may/will need to be disabled and the best way to do this? Thanks again for the input.