After some re-analysis of your log, I noticed you're running a 64 bits version of the JRE. These versions have shown memory leaks and other bugs. I think the symptoms you mention refer to that memory leak. Therefore I recommend to run a 32 bits version of the JRE.

JRE version 1.6.0_17 ("**External links are only visible to Support Staff**) is the last version that's compatible with jD.

If the problem isn't solved then I recommend the following procedure :-

1) Un-install all your virus software. You can also un-install your firewall if you've a firewall in your router.

2) Reboot your PC.

I hope your problems will be solved soon!