So far this has only happened on my marauder, which is still experiencing the hotbar revert, even after using many suggested fixes.
On first log-in, the tactics bar DOES work and can be interacted with. Immediately after zoning, whether flying or from SC, the tactics slots disappear and only a re-log will bring them back. Already reported as character bug in game. Do I really need to go to Git Hub as well?

Cheers.