I just went through a strange (to me) bug. Someone else made changes in a data base, by creating custom menus and sub-menus to launch reports, and renamed some scripts at the same time. All of a sudden a report was broken.
Searching around, I found out a virtual table was broken: all of the calculated field shown <missing field> in the calculations. I found out that for all the calculated field, Evaluate this calculation from the context of displayed <unknown> instead of the table name.
How is it possible for a table to loose it's context ? I use FMPA 13v05.