Can't trial a weapon, please help.

Basicaly that is it. When I press "try out" nothing happens, no matter how many times I click. I trialed one weapon since release, it was H-V45 (or w/e it's called) and it was like a week ago, since then I can't trial anything else. Help?

Have you tried going to one of the Resupply Terminals and going through the Depot?
Because I had a similar issue using just the menu but from the terminals it worked fine.

you have to be alive to trial, every time i try while dead it fails and works fine when i'm alive.

Thanks I'll try these