In the Transfers window, when you click on a column header to sort by, say, Priority, it does the sort but it is not persistent i.e. when you roll-up the file's sources and roll it back down (or go to another download), it will no longer be sorted. However, on eMule for Win32, this works. I have noticed this with xMule and now with aMule. eMule has gone through a couple of versions to get this right most recently correcting the sort function to prioritize Transferring status above Queue Rank 1.
Keep up the great work aMule team!
