I'm a science captain and I completed two quests (patrol risa and Kuvah'mogh). Each rewarding you with class specific kits which you get to choose. I chose the science kit both times and they never showed up in my inventory. Frankly, I don't see how something like this can occur. It seems to be random as well because my friends got their rewards and I didn't. Mind you, they were Engineers and Tactical captains. Perhaps only the science kits are bugged?
Nope, not just science kits...was finishing a Patrol (think it was the Vulcan sector one) and chose the Engeneering kit. I didn't think of it at the time, and about 30 mins to an hour later, was looking for it in the inventory, and it wasn't there; it was one to create a shield on the ground too, so I was going to try it and see if it was worth it.