I've been hanging back since I first got this vintage (1980s - manual converted to compu- in early 90s) 16-shaft, 40" FDL last February, trying various suggestions given here and on WeaveTech for wayward shafts. My problem is that shafts 15 and 16 are very unpredictable - rise when they shouldn't or don't rise when they should - with the result that I have to watch every lift to check (gives new meaning to "slow cloth"). What seems odd to me is that as soon as I hit "unweave," the correct lift is made every time! Ditto on the way back when I cancel "unweave." I've been in touch with the AVL and software (Fiberworks) folks, but we can't seem to resolve this.
My latest attempt was to put on a 15-shaft warp, but shaft 15 is still wayward--sometimes. It's the unpredictability of it all that is truly frustrating. At least the pattern on this one was only 8 picks long, so I pretty much memorized the lifts and didn't have to keep looking at the computer screen to see whether the shafts called for were actually lifting. Anyone else out there with this problem? Suggestions welcome!!