Hmm, ok, back to just threads then...

Removing everything that got to do with forking from _thread_for_images and adding:

        threads->create( \&mainloop2() )->join;
[download]

didnt help much since I get:
thread failed to start: Usage: threads::new(classname, function_to_call, ...) at ...
at the SECOND time it tries to create the thread! Which means, it works once! (so why not complaining then?)