Ok, I just tested a couple of WAV files (with text added to the end) and the MP3s produced from those WAV files. The WAV files have NO clicks at the end, whereas the MP3 files have a click at the very end.

What did you test the WAV files in? I bet they'd click if you played them on the car player, which doesn't grok tags on WAV files. As Tony said, your WAV player application may be deceiving you...

Peter