Just upgraded to version 1.91 from 1.90 for Designer, Photo and Publisher tonight. All three programs now show a Windows system error regarding igdrcl64.dll upon start up.
The first is with an executable called cltest.exe and the next with the executables for Designer, Photo, or Publisher.
If I dismiss the error, these programs start up normally and I can view and edit my existing work normally - so far at least. Have not tried creating new drawings/ publications afresh as yet, but will attempt this soon.
I am a Windows Insider, so the Windows 10 OS build on my production rig is Build 19043.899 (21H1)
Is any one else experiencing this? Is it a know bug?