Hello, just to clarify, can you confirm you are using the BPServer infastructure rather than direct to database connections? BPServer is required for Scheduler to work, and the BPServer must be able to connect to the resourcepc you want to start the process on (test that you can ping the resourcepc from the BPServer machine).
Also, if you think your infastructure is set up correctly there are scheduler logs in the Reports->Recent Activity part of the Scheduler GUI that might give you a clue