This bug has been existed since launch and is still happening. So far I know this happens with Focused Charge, Puncturing Strikes and their morphs.
When casting, there is a chance that your character will get stuck mid-animation and not be able to cast any skills, weapon swap, perform normal attacks, mount, etc. and your legs will be stuck in a running animation even if you are not moving. It eventually resets itself, but it lasts about 20-30 seconds every time it happens.
The game has been officially released for almost exactly one year now and I still get hit with this bug multiple times every day and it is unbelievably irritating. Is there any chance at all this will be fixed?
QQing is a full time job