You effectively had a problem: in some situations the server will give INTERNAL ERROR, and in those cases the file that was being handled stopped being synched until you fully stopped the client and started it again (you can see in your last syncdaemon.log that everything was correct there and the client reached IDLE quite fast).
So, I'm marking this as duplicate of other bug where we handled this case.
maroshka, papukaija, thanks!
You effectively had a problem: in some situations the server will give INTERNAL ERROR, and in those cases the file that was being handled stopped being synched until you fully stopped the client and started it again (you can see in your last syncdaemon.log that everything was correct there and the client reached IDLE quite fast).
So, I'm marking this as duplicate of other bug where we handled this case.