What's the version of your FSe plug-in?
If you can download them with your browser something is blocking jD. I recommend to :-
1) Allow java and javaw in your firewall and virus software. Disable (or un-install) the html/web download scanner in your virus software.
2) Reduce the Max.Con. setting (bottom right corner of jD window) to 1. Reset the affected links.
If your password contains special characters, please change it. Then remove your account, restart jD, and add the account again.
Also enable the account and enable "Enable Premium globally".
If this wouldn't work, please provide
a complete and detailed log.