Since the past few updates... every time I try to use the clean audio folder utility - when I go to delete the files I get an error?  anyone else?  "Cannot delete fike:" then the dile name...?  Whats going on? Never had this issue before?

Nice to have a thread that is not about the end of Sonar today;
 
My take is the clean audio folder utility has never worked the way one would think it should,, it is is what it is and most of use use other methods to get rid of junk.
 
The best I know of is to perform a "save as" to a new location only the audio used in the currant version will be copied. 

I agree with Johnny. Use the save as.
 
Im guessing you might have audio files that are being used in multiple different projects thus sonar wont allow it.
To confirm this: Use the CWAF tool instead.