I had this happen to me today as well, in 1.03; invading Samoa with no resistance bar a couple of land-based aircraft (which withdrew straight away). Invasion failed! I don't understand.
Speaking of bugs, in another battle I called for reinforcements and got CTD. Clicked R in the battle board, clicked to change a patrol location. When I clicked to resume game, the patrol location reverted and the reinforce popup didn't close. Next time I clicked - CTD. Error log attached.
I might mention I am using Windows 7 RC