I have just start using SQL Developer 4.0.2 on win7 x64 and I've found out that if I press DBA on View menu, nothing happens.
I've been using this feature a lot in 3.2 (x86) and this is stopper for me to migrate to my new PC.
Feature is installed and there are no logs in CMD if started from there.
Any idea ??
try resetting your windows
Window > Reset Windows to Factory Settings
That helps, thanks a lot.