I have GalCiv II Ultimate edition v2.03 and I have the problem with the missing Turn button.Sometimes restoring the game if I have a save, solves the problem.
Windows 7 Home Premium 64 bit.CPU: Athlon 5600+ dual-core 64 2,80 GHzRAM: 4 GBVideo card: Sapphire ATI Radeon HD 5670 512 MB GDDR5
Most likely is pressing space to find the next unit with moves. The turn is already ended, there are units with unspent moves, you have the skip past autopilot units at destination unchecked would be my guess. You would find the button in the options tab.
I had it before too until I figured this out.
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