I was going to make a post saying that I've stalled out while running xLODGen, it kept hanging when it tried to create the same file, mannygfo.4.-16-12_n.dds, but I seem to have found the issue. I'm just typing this up for other's reference if necessary. Like the comment on page 592 from rayhne, my anti-virus - AVG in this case - kept flagging during Merge Plugins. It turns out that it was doing the same in xLODGen, but only popping up in the background so I didn't see the warning and therefore couldn't create an exception. I didn't even know it was there at all since the AVG window doesn't even show on the taskbar. While redownloading the Gray Cowl of Nocturnal HD pack (since the file in question is from that mod), I took a shower and Windows Update decided to reboot my computer just as I got back. Figuring it was worth a shot, hoping the reboot may have knocked whatever the issue was loose, I ran xLODGen again and this time the AVG warning popup came on top of xLODGen, so I could actually set the exception. xLODGen picked up from where it had stalled and as I type this, it has just completed successfully! Now to run it for all the other locations...