As described in tons of other posts, I can't upload new files coming from my Linux with Firefox or Chromium. Nor can my wife from her Mac with Firefox. WP is on my hosted webspace @domainfactory.
Using the fancy uploader, upload stalls right after the beginning showing only the grey progress bar which does not fill. If I reload the site, it shows "An error occurred in the upload. Please try again later." for a second in red. Once it also showed "crunching", but only in one of about a hundred (no joke) tries.
Basic uploader just connects to the page for all evening.
I tried deactivating all plugins, removing plugin folder, swearing, downgrade to 6.1 (iirc, the problem first occured at 3.6.1 and I upgraded to 3.7 later), php 5.4.x instead of 5.3.x, swearing a bit more, checking all php.ini stuff as in here, using my theme (a slightly changed WP '10), using default themes, uploading other images, uploading audio files, tweaking upload folder permissions, swearing to every god I know, enabling logging (no log messages coming during upload and no relevant others before [I'm a php guy, I hope I can tell]), checking for file space, and surely a bit of other things including swearing.
What could I do? Is there no way that always works? I mean, I even exchanged all wordpress files back and forth, so it can only be stuck at some database stuff? Or what could I be missing?
I don't mind radical resolutions, as long as it's working and I don't have to invest hours over hours.