Okay, well that was NOT the problem.
What I found in error reporting was 1 = "AppHangB1" from when the problem first started a couple of hours ago and two = "APPCRASH" from later on.
I really don't know what is happening. Or if should list the additional information in the error reporting. It all says "Report sent".
Here is the first one: Description
A problem caused this program to stop interacting with Windows.
Faulting Application Path: C:\Program Files (x86)\PyxelEdit\PyxelEdit.exe
Problem signature
Problem Event Name: AppHangB1
Application Name: PyxelEdit.exe
Application Version: 0.0.0.0
Application Timestamp: 55b72f10
Hang Signature: 2257
Hang Type: 67246080
OS Version: 10.0.15063.2.0.0.768.101
Locale ID: 1033
Additional Hang Signature 1: 2257e14ff0101fb3885468362e15866a
Additional Hang Signature 2: ec06
Additional Hang Signature 3: ec06f809a46afda6b5e1e5ffe660e91a
Additional Hang Signature 4: 2257
Additional Hang Signature 5: 2257e14ff0101fb3885468362e15866a
Additional Hang Signature 6: ec06
Additional Hang Signature 7: ec06f809a46afda6b5e1e5ffe660e91a
Extra information about the problem
Bucket ID: e1a9fee9dc927b27b19373be12205c0d (50)
And here is the second and third, posted about 3 hrs after the first:Description
Faulting Application Path: C:\Program Files (x86)\PyxelEdit\PyxelEdit.exe
Problem signature
Problem Event Name: APPCRASH
Application Name: PyxelEdit.exe
Application Version: 0.0.0.0
Application Timestamp: 55b72f10
Fault Module Name: Adobe AIR.dll
Fault Module Version: 18.0.0.199
Fault Module Timestamp: 55b72fd2
Exception Code: c0000005
Exception Offset: 0057b434
OS Version: 10.0.15063.2.0.0.768.101
Locale ID: 1033
Additional Information 1: 2beb
Additional Information 2: 2beba6fb4680d73a8c78ca7c24ccdb46
Additional Information 3: ff01
Additional Information 4: ff013431b2f4a453b29f35e2462cacef
Extra information about the problem
Bucket ID: f42fe6b1093725de26da05963e595343 (108515093359)
I'll continue searching for a solution. If anybody can help, thanks in advance.