Hello! I have 4 SW part files and 3 SW assembly files which are all equation-driven and linked to the same text file (equations.txt). One of the assemblies is a master model containing the other subassemblies, so the feature tree is 3 levels deep. I can usually rebuild the master model with no problems, and all of the features in the parts and assemblies linked to the equations/equations.txt file rebuild properly. When this works, equations.txt and all of the variables in it are the same as they were before rebuilding, as they're supposed to be. 

Seemingly randomly though, when I rebuild at the master model level, all of the variables in equations.txt are deleted and replaced with the 2 variables used in one of the subassemblies, and updated to reflect the last values used in the subassembly instead of the value that was entered into equations.txt. This then breaks all of the other assemblies and parts since the variables they rely on are now gone from the .txt file. 

Has anyone had this problem before? I'm suspicious that it has something to do with the order that the parts/assemblies are rebuilding when I rebuild at the master model level, but am having a hard time proving this (and finding a solution if this is the case). If anyone has temporary or more robust fixes for this issue that would be amazing! Thanks