I still can't upgrade forts beyond the initial level (the Upgrade option button simply doesn't appear). This bug is game-ruining, and needs to be fixed imediately. And I do not have saves that go back far enough for relaoding to save the day--and if I did, I certainly would replay 40 hours, then have to monitor whetrher or not the bug is or is not ruining the game every time I research a bastion upgrade.

It's disppointing as the first Bastion upgrade is available whilst all your cities are still on the Kanabres side of the river, where you'll never need to travel. So just left my completed Bastion to use when I conquered a fort on the correct side and it disappeared.

Best you submit a proper bug report ingame via ALT+B.

Also, with this thread, you make the impression it is because you play an outdated version. So you can expect people to ignore your comment, since we are no longer with 1.0.4d but with 1.0.7f where the bugs around bastions are supposed to be fixed.