Cannot upload anything in the file manager

[Jahmann]

Hi I have exactly the same error.

I can create folders , but if i want to upload any item it loads, but then shows "303".
But i cant find any items.

I checked if the folders are writeable -> they are.
I also performed the webserver check within the support menu -> everything looks fine.
there is no log about this (unfortunatly) or i havent found it yet

can someone please give me a hint where to look?

thanks

stefan