Sound in Sonar suddenly disappears
I was in the midst of working on a mix in Sonar Producer 8.5 that uses audio and soft synths (Garritan GPO and JABB) as mockups for tracks to yet be recorded. I soloed and unsoloed the soft synths and suddenly I have no sound coming out of Sonar, although the meters in Sonar are running. Restarting Sonar makes no difference. I check routing and audio drivers, which seem to be fine, as far as I can tell. I opened Sibelius and was able to play back the source of the mockups through Garritan in Sibelius. I also was able to export an audio file of the mix, which played back just fine. Rebooting the computer and resetting the M-Audio Profire 2626 interface made no difference. I am using XP SP3. Any ideas? I have a session scheduled for this Thursday and need to get this issue resolved soon. I would appreciate any suggestions.