Quote:
Originally Posted by kh99
Someone else had a similar problem recently, it turned out they had extra characters at the beginning of one of the vbulletin php files. Did you recently edit a file (maybe config.php)?
Edit: Oh wait - wasn't that you?
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Me indeed

I've had a nightmare with attachments.. I've gone back through the thread and done everything as suggested but with no luck.
It just seems to be RAR/ZIP files. Images, text files etc all work fine without any problem.
Edit: It seems that having this fix applied was causing the issue
https://vborg.vbsupport.ru/showthread.php?t=303520
Looks like IE users will have to go without or use another browser...