[bug?] Ship build queue and fleet research
I queued the last 2 fleet upgrades. I then selected frigate factories in separate gravity wells to build Heavy Cruisers. So fleet showed a negative number. The first fleet upgrade kicked in but nothing built. I deselected the heavy crusiers from one gravity well until there was no longer a negative number in fleet supply. After that they began to build at the other gravity well. I thought okay, fine, now that they are building I can queue the other factory and then they will begin building once the last fleet supply upgrade is done researching. Nope. The factories at the other gravity well stopped building again.
The summary then is if you queue more than one fleet supply upgrade and then queue to build beyond the first upgrade the game will wait to build ships until both upgrades are researched.