| App fails to install | OS version / architecture | Ensure ctrlX OS V3.6.2; correct arm64/amd64 snap |
| Config not applied | Forgot restart | Restart after editing appdata.json |
| No connection | IP / Port wrong | Fix IPAddress / IPPort then restart |
| Wrong PSet behavior | PSet missing or malformed | Validate JSON & required fields |
| Enable blocked with error code | Error condition present | Check error code meaning in Error Codes Reference |
| Output buffer full | HTTP endpoint down | See Output Curves Troubleshooting |
| Log view broken | All columns enabled | Revert Logbook column layout |