After using IncrediBuild for some time, one day it started showing me some errors while trying to upgrade a Visual Studio solution file. The solution had not been changes at all. After some work trying to figure something out I ended up finding a workaround: reset Visual Studio user settings.
You can reset your setting by opening CMD in the location of devenv.exe of the Visual Studio version and running the command:
devenv /resetuserdata general
After that, Incredibuild doesn’t think the solution needs to be upgraded and it builds the solution normally.
I hope it helps someone.