There are a thousand reasons this can happen, but some are more common than others. I’ll list a couple of things I’ve found that sometimes cause this, and ways to fix them.
First, and this a fix for all sorts of weird, buggy 2020 behavior, is to download and run the clearcache app. 2020 Stores a lot of settings and data in the cache, and if one of those is messed up, this will clear it out and get you back on track.
1: Is it just that one file, or multiple files, that do this? If it’s just one, sometimes an item or element in a file becomes corrupted, and you can sneak around that by opening the .bak file, re-saving it as a .kit file with a different file name, and if you’re lucky, the new .kit file will work right.
2: Are you using any decorative or custom objects, particularly from older local catalog versions of 2020 decorative catalogs? Some of those aren’t compatible with newer 2020 versions, and can cause errors like this. Try deleting any such items from your design, and see if it fixes it.
3: Are you saving & loading from a local drive, or network/cloud storage? .Kit files don’t always transfer with all their attributes intact over remote or network storage, so saving and loading locally can often circumvent this sort of problem.
If none of those things fixes it, I’d recommend a call to tech support.
