Same problem here. This is my configuration:
- SSD drive with 2 partitions: 1 for the OS and the applications and 1 for BootCamp
- regular HD for data
- 2nd regular HD for TimeMachine
I've tried almost any solution suggested in different discussions (increasing the partition manually...) except of erasing disk and doing a clean install because I'm afraid of losing data of the Windows partition which is not backed up by TimeMachine. I'm not sure how to copy this partition.
Since this problem has been described for more than 6 months one could think there should be a solution available by Apple ?!?