I am not sure if someone else has brought this up before or if it is a glitch or not. Ok you know how if you have more that twenty fleet ships a new fleet 2 tab appears in the space dock. This really happends only if you have 4 or so homeworlds and mainly hacked and download ships from the AI, if you have more that 20 inlucding the ones you get at the start and gotting all five from the ARS, you cannot research the new ship type as the scince lab can only show the first twenty ships, it also seems to replace only one of the others I think it goes in ABC order. However you can still build it or the replaced ship, but after twenty a second tab does not appear in the science lab. This only includes the bonus ships and never replace the statdared ships you always get. Also the fab ones do not count as you only get the MKV. This rarly happens as its very rare you will be able to get more than 20 researable bonus fleet ships unless you took a lot of homeworlds at the start or hacked alot from the AI just thought I would say somthing about this I just remember this today, as I myself usally only play with 1 HW unless I want to test out a few ships quickly.