Well, don't trust too much on the average speed displayed in xISO xFER, although my values are pretty much similar to the speeds I get with FlashFXP.
Help me out here, will ya? If you can, try to do the same batch job, but check the total batch size. I think this is where the bug occurs. I might have used the wrong kind of data type for the batch size, so when this 'size' exceeds a certain limit
it kind of 'get out of bounds'...
If so, try to reduce the batch size by removing an xISO or two, and try again.
It will patch *any* XBE with the media check encountered while extracting/xFERRiNG.
When it comes to bug reports, y'all know where to reach me