Assuming that your using PEP v2 as PEP v1 does not have a "System Properties\Network\No Network" option you'll definately need to check each of your project components found under, "Building Blocks\Equipment & Codes\" to ensure an extender is not selected for each one. You'd think you could just click on that "Add Extenders to Project..." button there and deselect the extenders for the project as a whole, but when you do that the icon next to each of the project components you have an extender selected for turns into this warning triangle. Who knows at that point if any communication method will be used once downloading to the remote, so selecting each project component one at a time and ensuring an extender is not selected appears to be the only way to go. Hopefully this is your issue. If not, you'll need to provide more information.