The only time I have had an issue with Backstabbing is when thet skill is not mapped on my skills tab (even though I hate a hotbutton for it). When I mapped it onto my skils tab it worked fine. This may or may not be the issue you are having.

Which ones are you talking about? For the code to not work it would have to despawn, then respawn with the same ID. When you disarm most traps, it's still there it's just inactive. I'd need an example of a disarmable trap that does this to test it. It would depend on how the EQ server determines if...