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I'll attach a stack trace. It looks like the code on the AWT event thread is waiting to read some text/stream and blocks there:-(
Created attachment 36331 [details] Thread Dump
Just to make sure I understand: you invoked the wizard, chose a Derby database connection or data source, the Connect dialog popped up and you pressed the OK button in this dialog. Right?
After supplying the password, yes;-)
I consulted this with Petr Nejedly and he says it does not look like a deadlock. The IDE seems to be running, but it probably slowed down by something. Was the CPU at 100%? It also seems you are running under the YourKit profiler, could this be the cause of the slowdown? I can't attempt a fix based on the attached thread dump, so I'm closing the issue. If you can reproduce again please do several thread dumps in a few second intervals, then wait a minute or so, do more thread dumps, attach them all here and reopen. Thanks.