Installing 1.3.1 seems to have resolved the problem :-)
Found further info in the Application Log: Faulting application name: CryptSync.exe, version: 1.3.0.337, time stamp: 0x5af2dcbd Faulting module name: CryptSync.exe, version: 1.3.0.337, time stamp: 0x5af2dcbd Exception code: 0xc0000005 Fault offset: 0x000000000014f134 Faulting process ID: 0x646c Faulting application start time: 0x01d450c18f44ea70 Faulting application path: C:\Program Files\CryptSync\CryptSync.exe Faulting module path: C:\Program Files\CryptSync\CryptSync.exe Report ID: 6271adb6-fa83-4e49-bd65-aaa68b4c0563...
Cryptsync is exiting after a few seconds of running in the background