Locust

I seem to have an problem with Locust, when I give a unit the ability, I can damage nor kill it. I also cant remove the ability temporary so I can damage it.

When I remove the ability in the editor it works fine and the unit gets damage.

Any way to get around this?

I think that you can remove locust (aloc) using JASS. If not, try giving it the ability via triggers and then removing it, rather than having it start off with it.

I'm using JASS. And I've heard that if you remove it and add it it will remove the hpbar(which doesnt matter for me anyway)?

(but maybe that is only when I hide/unhide the unit before I remove the Aloc -.-)

Yes, the 'Aloc' section in the ability guide explains it in detail:
http://www.wc3campaigns.net/showthread.php?t=81742

Ok nice