This is a Lion Problem. I have a brand new MacBook Air, running Snow Leopard and have no issues. I have a brand new Mac Mini, running Lion and have all kinds of issues (no third party apps or programs-Brand new out of the box continuous Problem).
Copy freezes at the last 5 seconds of Very large files (upon system reboot, it seems to have transferred). All my files that were on NTFS and have now been transferred to ExFat (these transfers were all done on the new Mac Mini-without issue), freeze now, the first time I try to copy, move to trash, or when trash is emptied. Once the files have been moved (once), they will then work as normal and I don't get the reoccurring issue for that particular file. But I am constantly having to reboot my machine for this to work. It only fixes the files that I was working with, before reboot. So the next time I try to copy, move to trash or empty trash with a new file. I get the same issues and the whole process starts all over.
Force quit and then Relaunch doesn't work at all. Just gets stuck on white screen with spinner, for hours. Which means I have to reboot (hold the off button, to turn system off and restart). Then all those issues clear up. Until I move, copy or try to delete another of the (many NTFS transfer to ExFat Files that I have). This is a constant problem because I have about 8TB's of movies, pictures and what not on my Hard drives and I am always transferring files to other hard drives. I am afraid at some point they will become corrupted and all my hard work over the years will be lost, due to this GLITCH!
Any file that was transfered from apple to apple work fine, it is only the files that i have transfered from NTFS to ExFat, that seem to be the problm. But agian, i did the initial transfer on my Mac Mini, so I don't understand why this is such a big problem. The initial file transfers worked without issue! This is very frustrating to say the least.
Also, just to add, this happens whether the Hard Drives are connected directly to the Mini Mac or connected Via Hub. It is irrelevant. It is just a Constant Problem. I just updated my software again today, hoping for a fix but Alas, nothing!! I am still having the probelm. I have rebooted 4 times today.