Engineers and LAs with the underbarrel weapons can resupply their underbarrel ammo (grenades, smoke, shotgun) from eng resupply boxes Medics will get 1 ammo back and then never again till relog. Been this way since 5 patches ago in beta.
No, that they managed to fix. And my Engi has same problem with GL ammo. Sometimes it replenish from the ammo box, usually it doesn't. Sometimes it helps to resupply from a terminal, sometimes you still get only the grenades you carry.. :/ So far I've figured out much as it's lag based issue. More people there are running around, more likely it is to bug and not get ammo. If you're pretty much alone it'll work almost always.
good to know now they just need to make UB weapons a button not an entire weapon so that the shotgun can be usefull
This seems to happen AFTER getting resupplied, like the resupply breaks the underbarel grenades untill a relog. Didn't expect this to be fixed in a hotfix, so.....unberbarrel grenades are still broken.