If you increase the horizontal zoom to the maximum and then apply the "Grid: Adjust by 1/2" multiple times, this causes the Reaper to crash. In real work this hardly can happen, but I think that this bug should be eliminated.
Windows 10 x64
reaper.exe
5.9.1.62
5b2831c9
reaper.exe
5.9.1.62
5b2831c9
c0000094
00000000006198a2
ee8
01d4078dd3022e7e
D:\Reaper Beta\reaper.exe
D:\Reaper Beta\reaper.exe
b1ccc485-72ad-44fb-84f1-100528ba4536
reaper.exe
5.9.1.62
5b2831c9
reaper.exe
5.9.1.62
5b2831c9
c000041d
00000000006198a2
ee8
01d4078dd3022e7e
D:\Reaper Beta\reaper.exe
D:\Reaper Beta\reaper.exe
319d9c0d-aea5-4b35-a077-e600991b0722