Bug with undoing?

[gmc_nxtman]

When on a mac in golly 2.8, a bug frequently appears after the "undo" hotkey is pressed repeatedly, in which the undo button fails to work and the following error pops up:

Screen Shot 2016-03-08 at 6.22.43 PM.png (23.27 KiB) Viewed 5405 times

[Sphenocorona]

I've noticed a worse bug (or maybe the same bug with a worse outcome?) with undoing - in similar conditions on Windows, Golly will suddenly report that the rule specified is not compatible with any algorithm, making it impossible to undo any further.

[drc]

Sometimes, on iPad, I will accidentally hit play, but also trigger the notification center. This causes an infinite play loop.

[Andrew]

When on a mac in golly 2.8, a bug frequently appears after the "undo" hotkey is pressed repeatedly...

I'm pretty sure I've fixed all the undo-related bugs in the latest beta version.