No.286
>this is most likely your php.ini had limit on post_max_size and/or upload_max_filesize
True. Especially in the first weeks it wasn't completely clear at how many places the upload file size limit needs to be changed to be effective. The current count is four: Board config, nginx config and the two places in php.ini you mentioned. Could be that there were differences between these configs earlier which caused this problem. In any case: Thanks for the input.