sonar platinum hangs on user project open

hello:
 
i'm a long time sonar user and, after changing the connection method of my external soundcard cannot open previous projects. these hang whenever launched. here is a quick summary:
 

• Windows 7-64 & Sonar Platinum (both patched to current)
• No anti-virus beyond built-in Microsoft Security Essentials
• Soundcard connection interface changed from Lynx Aurora FireWire to USB 2.0
• Windows is able to see and use soundcard correctly (e.g., Windows Media Player, etc.)
• Sonar sees ASIO I/O drivers properly in Preferences
• Sonar hangs when opening user projects, including older .cwts that have worked
• Projects hang when Sonar is started in Safe Mode and when projects are opened in File Recovery Mode with no plugins allowed
• Does not hang when opening Sonar demo projects (e.g., SONAR_AudioDemo.cwb)
• WDM drivers were not compatible- “unable to open record device”
• MME drivers ok, but projects hang in the same way
• Similar behavior to Aurora when testing with built-in soundcard (Realtek)

i have a case opened with support and am waiting their response. any help or additional suggestions would be appreciated.
 
thanks,
j

zargg:
thanks for your time. i have tried that- both launching the sonar program and projects from within with shift held down  (which opens the program in safe mode and the project in file recovery mode, respectively, i believe). same hanging result.
 
j

zargg:
 
it looks like that did it- thanks! i'll spend some more time verifying but i really appreciate your help.
 
j