I’m using samj’s portable so it may just be related to this, but here goes. For a newly opened GIMP session, I paste a result from image say web browser. If I do some modifications in GIMP and then copy result to clipboard, paste it in a completely different application and do some modifications of it and copy that result to the clipboard, when I try to paste back into GIMP, I still get the clipboard that GIMP copied. If I paste to yet another independent application, I get the correct clipboard data from the newly modified version from application mentioned before. Does the new GIMP somehow use an internal clipboard buffer, and, if so, is there a way to clear that buffer. 
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Posted this query at GIMPChat as well and both Paul and iarga confirmed this bug (or feature if you want to think of it as such). Paul confirmed that it also affects Linux version of GIMP. iarga went further and found a work-a-round. Anyway, just sharing the update.
Possible bug; need someone to independently verify this behavior. • GIMP Chat