While in the Data view of a database table if I right-click the program's index column (recently added, not a table column itself) and move my mouse over the "Grid view options" menu the program says an error has occurred in the program. A quick visualization:
I'm able to recover without restarting 100% as far as I can tell. A little more testing, this also happens in open space though not if I right-click on a row first. I'm using 12.6.0.6765 and there are only nightly releases available. I'd imagine this is some minor if condition.