Try converting the MP3s to Wav files (using the free download Audacity).
Although technically the program accepts MP3s, they have been known to cause buggy behavior -- especially if the MP3 has been downloaded from a site like iTunes, Amazon Music, etc.
At this point, with all the editing I've already done, I would just have to edit each clip in Adobe Audition, make it one LONG wav file and reinsert. Good gravy. But thanks for this info. I was hoping not to have to work on this another hour or 3.
Well, here's hoping that we've saved you lots of headaches in the future.
Meantime, if you want more tips like this, you can always check out my "Muvipix.com Guide to Premiere Elements 14" (or whatever version you're using) on Amazon.
There will be no next time as next time I will not let someone give me 4 hrs of music and 75 dusty photos to scan and 3 weeks to complete, But it's their 50th. Thanks for your help, and I will look at your site,