Ive ran into a 1.51 bug. the AI is completely broken, atleast for me.
Custom map, layout is multi-system, 4 enemies, 2 allies, set locations and planet bonuses and artifacts using all forbidden worlds stuff.
game was great in 1.5 patch, huge armies, hard AIs, ive killed a dozen titans and a hundred capital ships and lesser ones in 2-3 hours.
patch 1.51 is installed, AI does nothing in new game, using the same custom map, minor mod (adding more strikecraft to titans, and making them 10x longer to build). 2 1/2 hours in im angry ai hasn't attacked, ive almost completely maxed out research and colonization, got huge defenses, waiting for them to invade for some epic battles. nothing happens, quit and load the game as an opponent:
it has 2 capital ships, 6 colonized worlds with almost no upgrades, no combat frigates or cruisers (all scout and envoy), and almost no research done, such as tier level one crap. this is a hard AI with 3 allies which are all hard too, and none of them have done anything in 2 1/2 hours!!
the same map, the same enemies, the same AI, the same setup in 1.5 accounted for battles with 100s or ships, titans, and dozens of capital ships repeatedly in the same amount of time. I had thousands of destroyed enemy ships when I won the other game.
The AI does nothing, so took a generic game map, added abunch of star bases on a chokepoint planet and titans, lots of cash, started the game, used the map, vicious ai enemies, upgraded all my starbases and researched all the military upgrades on quene, then left the game running for 6 hours.
came back and not much had happened. no destroyed starbases, 4 titans in the 5-8 range of experience. loaded the game as an enemy, huge fleet doing nothing, somewhere close to 400 ships between 4 AIs at one planet. reloaded, and they never attacked in an hour.
tried with mods, without, generic maps, custom maps, different races, different levels, and the AI consistenly does absolutely nothing??? games are completely meaningless, the AI does nothing. my allied ones, do even less, in 2 1/2 hours a Vasari medium occupied 3 planets and had built no ships or anything, like all it did was research cause in that time it offered me every level of diplomacy pacts, but had built nothing???
the 1.5 patch was supposed to make AI use 50% of income on ships, well with 1.51 they use 1% of their income on ships, and don't do anything at all???