In Avid Xpress, an indicator of mismatched sample rates are grey waveforms (sample plots). http://www.geniusdv.com/weblog/archives/audio_video_underuns_in_avid_x...
A great feature of Avid Xpress is the ability to detect old media files, even if the projects themselves have been deleted. http://www.geniusdv.com/weblog/archives/using_avid_media_tool.php