Well they fixed my issue.
It looks like the source of the issue was a lost pair of weapons. I logged onto your character to have a look and you didn't have any weapons equipped at all or in your bags. I gave you a pair of the starter katars again and it unlocked your Martial Arts tree again. I spent some points in the tree to make sure that it was fixed, but you should have enough cash on you now for another respec. If you lose the trees again in the future, check your buyback tab to make sure you haven't sold off your weapon. If the weapon disappeared mysteriously, let us know the name and we'll be happy to reimburse it for you.
Also...
I was messing around and came up with this, I just need a hood and change power set.