Scapple won't start Windows 7

I have been using Scapple on Windows 7 for about 3 years (June 2015)
Today out of the blue, it will no longer start on my machine.
The logo splash screen appears, but it never advances beyond that.
I rebooted my system, and I uninstalled and reinstalled Scapple (to another disk) - no luck.

I checked the scappl.exe*32 process in Task Manager and it is stuck at using 25% of the cpu and about 14MB of memory. But the program never starts.

The only recent change to my system was an upgrade to Java.