I just cut one of my main project files that I have been using for years and after installing 2.1 the parts cut with out placing any of my manually placed tabs. These tabs had been working perfectly for a long time and now it seems they are gone.
Is there anyway 2.1 may have lost them? Or have I done something stupid again?
Hard to know without looking at the file, unfortunately. Can you send us a copy or upload it here?
You can do what I’m going to do yourself, if you like - open the file in 2.0.05 as well as 2.1 and compare. You should be able to see the tabs cut/not cut on either version. You can have multiple versions of LightBurn installed concurrently if you set your install directory to be non-default.