Okay, if you can shoot me over some FTP details as above then, I'll step through the code and debug and find exactly where it's breaking.
Oh my god.
Nevermind, i was a total idiot.
When updating the the php settings to allow larger file uploads. I missed the "M" off the variable.
I've now fixed that an attachments are no longer 'vanishing'
306oc@306oc:~/public_html$ less /home/306oc/etc/php5/php.ini | grep upload_max_filesize
upload_max_filesize = 10M
Please let me go hang my head in shame. Cheers for the previous tips though.
Oh! I guess that's why the error wasn't being handled by MyBB then, the server was just outright rejecting the file. Well there you go, glad it's sorted!
yep!!
back to internet 101 i go
Don't worry, I've done worse