This action will reset your project, proceed anyway?

Since yesterday with one particular assembly a VBA window pops up saying:

"This action will reset your project, proceed anyway?"

The pop up happens when I open a assembly.

- Solidworks 2015

- No macros were active during these messages.

- No macros are related to any of the parts or subassemblies.

What's happening?

SolidworksApi macros