Quick update: it is pretty clear that the issue is rendering charts on this older machine; OpenCPN seems to handle the NOAA RNC's just fine, while Expedition struggles with them, even more so with the NOAA ENC's. Is there a chart product that is known to be noticeably faster? Otherwise running a synoptic chart as a base map or the base earth map are much much more useable, at least in 11.19.2. I know there was a change in 11.19.3 for auto-charting, maybe that impacted older machines lacking newer graphics cards?

That could possibly be the issue on this older Lenovo T450s.

I'll play with a full cleanup and reinstall next week to see if that improves things.

That suggests you don't have write access to the marks.dat file.

Possibly also the data folder.

I'm running Exp4D, C-Map4D on Windows 11.  Exp loads, initializes charts and instruments, but hangs on "loading tides & currents" for maybe 10 seconds and then crashes with no error message.

I've tried repairing Exp, deleting and reinstalling Exp, and deleting the entire Expedition folder in Program apps, but it's clear Expedition is leaving configuration information somewhere because it always comes back to the same configuration screen when it tries to boot.  The system was working fine, but I had to delete and reload a C-Map chart and since then clearly Exp is having problems with some configuration data or whatever on the system.

Any advice on how to wipe Exp and all supporting configuration files completely off the PC so I can start all over with a clean, default installation?

Thank you!