Running on multiplayer and going through my usual manual start-up procedure. After starting both engines and loading up pylons, I go to load -> Load DSMS (instead of load all, since I don't want to lose my custom HMCS settings). If I then look back and flip the safety cover for the ground override on my back left console, or flip the switch for ground override, those two will lock in place and I can't move them. This only happens in the few seconds when the DTS is still loading.
If I load the DTS and wait for it to complete, I can flip the ground override off and on with no issues.