date tab settings changed in the register

sdbarkley said:

Having the same issue as LMD described above with Home and Business R33.7, Build 27.1.33.7 on Windows 11. Worked flawlessly before but date behaviour changed recently.

There haven't been any changes to Quicken Canada in over a year, but I see that you moved to Windows 11, possibly on a new computer.
Between the old Windows and Windows 11 what changes were applied, specifically with respect to Date format in Windows and/or the Region settings?
AFAIK, Quicken works best if the format for the Windows Short Date is set to MM/DD/YYYY or DD/MM/YYYY.
The Date - specific keyboard shortcuts may not work so well when other Date formats are in use.