Freezing upon database switch

[Spliff]

@cnewtonn: Mine (but I suppose you address your suggestion in particular to karelt?):

Ultra Recall Professional 6.2 (x64)
Copyright © 2004-2021 Kinook Software, Inc.
Registered to: XXX (1-user license)
Windows version: Windows 10 Pro
Install path: C:\Program Files\UltraRecall
HRW15.DLL version 15.0.0.1
HTW21.DLL version 21,0,0,0
msptls.dll version 15.0.4420.1017
msvcr100.dll version 10.00.40219.325
PolarSpellChecker.dll version 4.0.5.6
riched20.dll version 15.0.4420.1017
SftPrintPreview_x64_U_20.dll version 2.07
TEW26.DLL version 26.0.0.7
UltraRecall.exe version 6.2.0.3 [this is the current one, I checked on purpose today]
unins000.exe version 51.52.0.0
Database filename: [path\]A.urd
Database version: 4.0.1 [FTS]

When I spoke about the lacking robustness of my newest W10 update, that was because in UR, I got repeated "black screens", but no "bluescreen"; did not repeat itself in-between though.

"No issues there." might be a little bit vague - do you just mean UR-Windows interaction?

For example, for the last 14 days or so, just my main UR database (i.e. "A" for "Allgemein" = "General") re-opens automatically on every new session, any further databases I then have to re-open manually, this with "Reload selection and tabs from last database session" ON (as always, and I checked this again); this phenomenon also "survived my latest "Compact and Repair" (which reset my 15s wait for the ("A" only now) database visual rendering to "almost immediately" indeed).

And for such phenomena, it's never entirely evident if those are UR or UR-W10 issues; whilst it's obvious that they just occur on some systems, not also on others, e.g. yours.