For the sake of page loading and space I'll just link the screenshots rather than img tagging them.
BananaLive - here you'll see the correct files are uploaded to the correct locations:
tmnt_getuser.php
tmnt_selectuser.php
clientscript.js
And here you'll see what happens when I try to enter the Username:
Adding Username - as you can see, it resolves the name having successfully found the member in the username field itself..
Note: I've tried it both ways, by ignoring the offered username in the dropdown, and by selecting the username in the drop down.
But once I click "Fetch UserID" you'll see it automatically populates the UserID field with the HTML output that Wakko and I are both seeing.
This happens in both IE 7 and FF 3 on two different computers (etc etc etc).
Any ideas on what is going wrong?
I'm running 3.7.3 Patch Level 1 VBulletin and the problem seems to be only with the UserID Fetch, as it works perfectly fine if I manually input both the UserID and the Username.
Edit - just saw your post with the file attachment, I will try that really quick as well. Thanks so much for supporting your mod, by the way. It's one of the things that makes this community freaking awesome!