I'm sorry to hear that you are still having problems.
Can you please try switching to a completely new workspace, create a new "Hello world" project for your target MCU using the new project wizard, then try debugging that. Can you then successfully start a debug session, or do you still need to start Redlinkserver manually?
Something else to try would be to remove any non-essential USB devices from your system. And if you are using a dock of some description, try starting a debug session when not docked.
If you are still having problems, can you please confirm the exact version of Windows that you are using (and also whether this is an English or another local? Can you also ZIP up and post the .metadata\.log file from within your new workspace directory.
Regards,
LPCXpresso Support