Unable to attach files after TP installation

[me123]

SMF 1.1.4
TP 0.983

After TP installation I (and members) am unable to attach files to my/their forum posts... When you click 'send', the page freezes (it looks like it is uploading, but the progressbar is not moving at all.

I checked my attachments folder (SMF) it is in 777.

I did not use the TP download feature, but while trouble shooting, I enabled it. Also there, I am not able to upload any files... It just 'hangs'...

No errors in smf forum error log.

[me123]

A quick update after my investigation:

There have been members uploading photos as attachments to their posts AFTER TP installment... So it has nothing to do with TP I think...??

If anyone can give me a hint in what direction to search for a solution, that would be nice...

[me123]

OK, my hosting provider did an 'account reset'. Now all works ok...