I have a student that says her basemaps are crashing when she tries to open them in ArcMap without logging into to ArcGIS Online. This was not an issue in 10.6.1. I am using 10.6.1 for my classes, so I do not have any experience with 10.7.1. Any suggestions? Thanks in advance.
I'm having issues with this as well. In my case, the basemap itself freezes up and won't move if I pan or zoom. Additionally, if I'm in an edit session drawing new lines or points, I can't see those lines or points until I stop the edit session. This behavior doesn't happen without basemaps so I'm pretty sure that's where the issue is. It's incredibly frustrating and time consuming because I basically have to restart ArcMap every time this happens.
It is likely that they have activated the "hardware acceleration" tool, I suggest you deactivate it:
Technical article: Bug: ArcMap crashes when adding basemaps or accelerated raster layers.
I hope it helps.