@James-Strawson Thanks for your reply! It made me realise what the error must be. We use a locally cloned repository for libmodalpipe because we want to build our software directly on the drone. This is then used in the build and link process of our software. This happened to be on the 'master' branch and not the 'SDK-1.0.0' branch. So the pipe clients use a different version than the pipe servers which is likely the cause of our errors.