I had that fleet issue as Great Britain late in my game. I'd made a new fleet (Admiral's 1st rate flagship and 13 first rates) and was unable to use it, because anytime I clicked it the game would crash.
My most recent fleet issue was as the Dutch. I could use the fleet fine, but any merging with another or sailing into port crashed the game. Strangely, I was able to sail one ship at a time into port (I was transporting troops) and offload just fine, then the fleet worked normally from that point on.
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