Since we've added more stringent type checking on data types, some of the old test plans (including cal plans) will fail to compile on newer images. They fail to compile because they have improper data save formats. This is easy to fix if you know what to look for.
If you get an invalid format message on a test plan which used to work, just try changing the format. If it works, great. If you get a walkback or bad format choices, just keep replacing/changing the buttons which feed into it until they are all synch'ed up. Re-picking measurements and calculations often resets the internal data type.
Sorry if this seems like a problem, but it really is solving more problems than it is creating.