19.1 released on Win7.

I suddenly had a repeated Studio crash... well, it happened 2 or three times in a row... not sure about the first one... it was just gone, but restarting it, opening the workspace and attempting to compile & run got me:
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Name:	Screenshot 2019-04-11 at 15.33.00.jpg 
Views:	118 
Size:	177.3 KB 
ID:	12716


Problem signature:
Problem Event Name: APPCRASH
Application Name: Studio.exe
Application Version:
Application Timestamp: 5c9cb5b0
Fault Module Name: vdfdbg.dll
Fault Module Version:
Fault Module Timestamp: 5c9cb65b
Exception Code: c0000005
Exception Offset: 00023403
OS Version: 6.1.7601.
Locale ID: 2057
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

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It has stopped now. I removed / commented out recent bits of the app (a webapp), compiled and ran, then gradually reintroduced them, fixing one bug along the way. Not quite sure what to make of it...