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Just downloaded 4.1.3, and I cant get it to open correctly. About 10% of the way through the loading bar, it stops and opens a tan/greenish window that says "opening main window" at the lower left and then all of SQL Developer stops, no CPU usage and memory usage is flat.
Windows 7 x64
SQL Developer 4.1.3 x64 w/ Java 8
I am still able to run SQL Developer 4.1.2 and 4.1.1 on the same PC.