Auto Attack breaks stealth combat abilities.

I go stealth click hidden shot and auto attack but don't hidden shot. This is with all stealth abilities so now I can't use any of my stealth skills because auto attack breaks it before the combat ability goes off.

Just restarted playing again and it was never like this before.

Try this: Open your character window, click on options, scroll down and change auto attack mode to automatic. If that doesn't work try turning auto attack mode off.

This is reported with parses in this thread: Auto Attack Breaks Stealth