I’ve been just putting up with this, since I can work around it pretty well with snapmarks AND because I really don’t want to lose them if I have to do an exchange…BUT my warranty will be running out soon, and I thought I’d better get it addressed before that happens! It can still find snapmarks, but it NEVER identifies PG materials any more.
This is how it used to look: 
This is how it looks now (with lenses and mirrors all freshly cleaned): 
ouch, that got way out of focus - sorry to hear it.
Didn’t notice it much until the other day but mine is off 1/4 inch too but mostly on the far far right side. In the middle it’s less than 1.8 and on the far left it’s just over an 1/8. As for not recognizing the PG material my first was ok for a while then quit and my second never has.
The one thing i find interesting is that I can place the design on the far right side just inside the area and it start right where I place the design and then shows the difference when it’s completed and re-scans. The only time I see this as an issue is when i go to engrave the reverse side of the same piece, I can’t re-set the design and have to be careful not move the material in order for it to engrave the reverse. I’ve had the same issue when using the snapmarks.
That’s where I was. I ended up sending it back and getting a replacement but lost my Snapmarks. I’ve learned to live without them again. You just go back to regular jigging or scoring outlines to place your material on.
Is your lid camera loose? It doesn’t seem like that should be possible unless it has physically detached or unscrewed.
Nope, it’s fine.
Only two things I’d check are if the door might have gotten loosened or if the table it’s on shifted and got out of square / non-level.
No door issues, and the table is super solid. I built it to be vibration-proof for my 3D printer, before I got my GF and realized there wouldn’t be room on it for both of them. It’s a 1.5" thick heavy wood table top mounted on top of Ikea cabinets and fastened to the wall on 3 sides…actually it kinda goes THROUGH the wall at one end because it was just a tad too long to wedge in, and it was easier to carve out the sheetrock than to trim the tabletop.
I might have had to jump on it a little to get it in there. 
Unfortunately, it looks like your unit is experiencing an issue that we can’t resolve remotely. I want you to have a reliable unit, so I’m recommending we replace this one. I’ll be in touch via email to sort out the details. I’m so sorry about the bad news.
