'column sets can be set up in the Administration tool'
To see a BOM column set you need to
1. Have "see computed BOM" rights to at least one BOM column set
2. Have the "see computed BOM" folder right in the folder you are looking in
Since they were able to see the BOM yesterday, I'd guess #1 is good. Perhaps they are looking in a folder they never have before? Confirm they have the proper folder right.
Guessing that this issue isn't likely related to being able to checkin the file...I am not sure how they could be related.
See if you can check in the file with any other tab other than the BOM tab active. (i.e. the Version tab)
Thanks for the advice. I'm going to go check the problem against what you suggested.
More to come!