Trying to get IMCE with Filefield Sources working (no Upload button in popup)
Ah! Like, Filefield Sources no longer lets IMCE do anything except browse your files and select one of them (for security reasons i think). That's what the situation seems to be, though i can't find anywhere that says that explicitly. 

Luckily there's a patch which reinstates the missing functionality...

http://drupal.org/node/877452#comment-4499144

The maintainer of Filefield Sources links to that patch from the module's project page, so it's a recommended patch.

All functioning now :) Can i have my Sunday back now please? 

++Thanks to ufku for providing the patch.