One of the two issues sometimes occur in Asset Forge 2.5.1a (Windows)

Using a model I made in 2.4.1:

#1. Pressed vertex snap and proceed to snap the block to another -> pressed undo -> block sometimes goes missing/ whole obj goes missing.

#2.  Pressed vertex snap and proceed to snap the block to another -> pressed undo -> block comes back, the x, y, z lines show up but I can't select anything (literally anything)