Thanks for your efforts! Whatever I can do to help resolve the issue, I am more than willing to provide!
v4.0 works just fine.
I think I could narrow down the problem source a bit:
I noticed the 'Scanner Options' dialog changed
slightly from v3.08.01 / v4.0 to 4.8.2. The 'Interface' listbox
which let me choose between 'WIA'
has been removed (and I assume both interface types are enumerated automatically now). My scanner works with 'WIA' in v4.0 (and earlier), but if I deliberately choose 'TWAIN', I get the same freezing as with v4.8.2.
Maybe if I could force SC to only search for 'WIA' devices (maybe with an 'ScreenshotCaptor.ini' option) it would work and you would not have to reintroduce the 'Interface' listbox if it works just fine for the majority of users.