The editor works perfectly for me, but as someone posted already, the stats listed in the program are not the ones that are edited in the game. I will have a look at my save and try to make as complete a list as possible.
To use the editor to edit the stats it has listed, you will need a save that has not been updated with any patches. It works perfectly then. The updates has messed around all the stats on the editor. Step 1: Clear your cache Step 2: Make a new SFxT save on a USB stick. Step 3: Use 360Revolution to transfer save to PC. Step 4: Use the editor to edit the stats. It automatically rehashes and resigns the save. Step 5: Use 360Revolution to transfer save back to USB. Step 6: Load STxF offline. Some achievements might pop (depends on what you edited and what achievements you already have).