Going back to a previous save to correct this problem will unfortunately set me back a year or two in game time.
Maybe you should save more often?
I Quick Save every turn, and a Full save every few turns. I also mentioned that my Auto-Save is supposed to enable every 10 turns, but that has screwed up too. This bug that occured isn't readily apparent unless you look at the Krynn's planets' productivity and I had no reason to do so. So by the time I DID notice it, all my recent saves had gone PAST the point the bug occured. So saving more often doesn't help unless the bug is immediately noticible.
It's like another bug in my current game, the Iconians and Torians only produce planetary improvements on half their planets. A large number of their worlds have no buildings on them at all. But I won't see that glitch until I've let both races colonize fully and I've reached a spy level that will allow me to see their planetary improvments. At that point, it wouldn't matter how many times I saved. I'd have to go back so far anyway, and I wouldn't even know when the glitch occured.
And, just curious, how can the Altarians accidentally attack you? And, how are you so sure it was an accident? In fact, how can anyone attack another ship by accident, except to send a ship to an occupied space that is covered by the fog in which another ship is located? And even then, you get a warning message that you are attacking someone. I doubt that the AI is so stupid that it would go to war over occupying an otherwise neutral space - by accident. If that were so there should be many more incidents like this being reported.
No, it was an accident. I know because I reloaded and they didn't attack me the second time. One of their fleets was right next to one of my planets with a fighter in orbit protecting it. They attacked that fighter. It's as if they wanted to move and instead assaulted my planet. My relations with the Altarians were Close. They had no reason to attack me. The Drath were not part of this game, so they couldn't have asked them to. The Altarians liked me. I liked them. *shrugs*
And yes, reinstalling is looking like an appealing option right now if it is true that this game just devolves over time.