Tried the beta v1.1, and occasionally Explorer.exe restarts and leaves the following in the Event log.
Running Windows 10 Pro 64bit, 32gb Ram, GTX 1660 Ti (6gb) and an Intel 10 Core i9 10850K 5.2Ghz Processor:
Faulting application name: ApplicationFrameHost.exe, version: 10.0.19041.1, time stamp: 0xab5c15e1
Faulting module name: Curtains64.dll, version: 1.0.6.0, time stamp: 0x5f451ccc
Exception code: 0xc0000005
Fault offset: 0x000000000001ead0
Faulting process ID: 0x30ac
Faulting application start time: 0x01d68a5f9396631d
Faulting application path: C:\WINDOWS\system32\ApplicationFrameHost.exe
Faulting module path: C:\Program Files (x86)\Stardock\Curtains\Curtains64.dll
Report ID: 63243cd8-8d66-4f03-b8fb-7565392bc624
Faulting package full name:
Faulting package-relative application ID: