Well, we thought that about 1.42, and we apparently didn't have it tested long enough before releasing it.

Tons of addons in the Gmod world, always possible a popular one might break something or conflict in a way we didn't consider.
Good coding projects will almost always have this type of cycle, release, and beta.
Anything on our repository is considered beta, anything on our ulyssesmod.com/downloads page is 'release'.