Not sure if enough people are still playing this game to find a cure or work around for this bug, but here goes.

Every so often in games, my economy will just reset with different production numbers before and after the event. All my plantets' incomes will suddenly loose 30-40% or so.

So far I have noticed two direct triggers, but it happens other times that I haven't been able to narrow down. The first is the diplomacy screen. Sometimes when I trade with other races it will go fine for a couple of trades, then blam! I make a trade that suddenly destroys my economy. Example: making about 300 bc or so per turn. Learn a tech that I don't mind selling off to the other races for some cash. Hit the diplomacy screen, trade with a few with no problems. Getting cash for the tech, all is good. After each time I check my income levels and they are all holding firm. Then I will go trade with another race. Complete the exact same sale of the new tech to the new race. When I go look at my income levels, I am now losing hundreds of bc per turn from the very same economy. And it isn't any other numbers that change, but my "income" from colonies. All my costs, trade income, maintenance, tourism numbers stay the same. My colonies just stop producing the same amount of money.

I can also see the income drop for each planet on their individual screen as well. On planet I watched through the collapse event had an income of 199 per turn before, and then after the bug in the diplomacy screen dropped to 136. 

The other time I have noticed it happening is when I finished off the Research Capital improvement on my dedicated science colony. All planets throughout my system lost 25-35% of their income and resulting revenue. The maintenance and production costs stay the same, but the income from taxes tanks.

What is causing this? Anyone else out there ever have this problem? I have searched and searched, but haven't come across it on any threads.

Maybe it is something to do with later versions of Windows running these games designed for earlier versions. I am just taking a guess, but the game is becoming unplayable. Totally takes diplomacy out of the game for me. Sometimes it happens when one of the other races just makes me an offer of some cash in good will. Blam! Economy tanks.

Hope someone out there knows of a cure, or answer or whatever.