Lost Audio

I just lost audio again. It had been working just fine - I actually had two previous support desk tickets on this same project. I have my file on my c:drive and I'm also following all of the other recommended tips to keep this from happening.

I notice in the project.log file the following (this is just an excerpt from the middle of the log file):

RF: XT -\quizmaker_288\quiz_content\_WindowClose.mp3 - 0
RF: XT -\quizmaker_288\quiz_content\_ControlClick.mp3 - 0
RF: Read folder - \quizmaker_288\quiz_content
RF: Read folder - \quizmaker_288
XT: Project extraction completed successfully.
Renaming SFNs to LFNs.
== END : 08/03/2012 11:33:55==
OPF: ID-APMsg-6
OPF: Uses project file.
OPF: Contains reference to previous PPTA.
OPF: Project file found in referenced folder.
OPF: Renamed existing project on disk as Family medical leave act-old.ppta
OPF: Copying associated project - C:\MYPROJECTFILES\PPT\FMLAWFMLA.ppta
OPF: Error --2147467259 Presentation (unknown member) : Failed. at 1420
OPF: Project already open.
OPF: ID-APP-6
OPF: Uses project file.
OPF: Contains reference to previous PPTA.
OPF: Project file found in referenced folder.
OPF: Renamed existing project on disk as C:\MYPROJECTFILES\PPT\FMLAWFMLA-old.ppta
OPF: Copying associated project - Family medical leave act.ppta
OPF: Project already open.

The time stamp shown (11:33:55) is almost the same time that is on the -old.ppta file that was created. Cany anyone explain what the error messages in this project.log file mean? 

Thanks,

   Melanie