Umm...something went wrong here...
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This is a screen shot of my empire's expenditures. 183 million bc on ship maintenance?!? Autosave file was unloadable after this. It had apparently made this calculation on the turn before, and thus killed my treasury by that much.

And this is a listing of the ships that I had been maintaining. Yes, 8 total. My treasury was still at the 39,000+ mark on the turn loaded by the previousautosave file. No new ships were built, no planets acquired...

I'm not sure what happened to cause this major problem, but it's certainly a show stopper. If I didn't have to go right now, I'd try the previousautosave file out for a few turns to see if it repeats the problem. I'll report back when I have more time.
(I hope the images work...)

And this is a listing of the ships that I had been maintaining. Yes, 8 total. My treasury was still at the 39,000+ mark on the turn loaded by the previousautosave file. No new ships were built, no planets acquired...

I'm not sure what happened to cause this major problem, but it's certainly a show stopper. If I didn't have to go right now, I'd try the previousautosave file out for a few turns to see if it repeats the problem. I'll report back when I have more time.
(I hope the images work...)
Good luck