I've not had this problem myself, but a couple of thoughts....I am guessing that you are building the model as a library (.so or .dll), then loading that through MD. Try loading the library with the command line tool Model Shell instead, passing -S (note the s is upper case). This will start the model with debug enabled. Launch MD, the try connecting (not loading) to a simulation. This should tell you whether it's MD that has a problem or the model/plugin.Assuming its the plugin, check you host OS and build tool chain. Are they what the Fast Models tool chain call for? The Tarmac plugin is shipped pre-built, but you have to build the models yourself. The crash might be down to you using a slightly different version of GCC to the plugin, causing weird runtime problems.