In 99.44(2) from an open event sheet, not the one attached to the layout, clicking in the Layer panel on the right causes a crash.
To test simply make a new direct-x game, Create a new event sheet, open it. Then click in the layer panel on the right.
Simple .cap to test
Confirmed this is still happening in 0.99.72. Just found it myself, came to report it, and here is the problem already reported! :)