Virtually every search I do on audio files comes back with a garbage can designation for quality. What has happened?

Read here on how to increase the quality of the search results:
How to find music

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"Never Argue With An Idiot. They Will Drag You Down To Their Level, Then Beat You With Experience"

And just to add a little bit...

Your junk filter might need adjusting. Within LW tools > options > filters > junk. From there you can adjust how strict or relaxed you set the filter, maybe you need to relax it a bit.

What you see marked as junk is determined by your filter preferences. If relaxing the filter doesn't help, you can always forget the training data & start again Check out this thread for more info about the junk filter (it's really long but there are some good tips).

Junk Filter

Filter preferences are at the default for latest version of Limewire Pro. Didn't have this problem with previous release. I'll reduce from the default and see what happens.