The game seems to have a nasty new bug now: the “random release of the left mouse button”. Whenever you need to hold a mouse button (Gravity Gun, for example) the game now “releases” it randomly every once in a while. In case of the Gravity Gun this sends you sailing to wherever you happened to be pointing at that time.
This bug criples the game.
It just happened with the bow as well. It fired off a few arrows, while I was holding under tension. Not often, but it happened.
I also noticed “the other change” about the bow: When you hold it, pulled back ready to lose the arrow, the energy doesn't replenish anymore. I'm guessing that you are not into archery. Holding a bow under tension is by far less “energy consuming” than holding up a heavy assault rifle. ;-)
Was the bow so OP? How about the Carbine then? Cheater's favorite...