: Some versions of SmartPSS (notably v2.002) have a known bug with the dhnetsdk.dll file that causes playback to fail even when the timeline shows recorded footage. You can fix this by downloading a newer version of the dhnetsdk.dll file and replacing it in the installation folder (usually C:\Program Files\Smart Professional Surveillance System\SmartPSS ).

C:\Program Files\Smart Professional Surveillance System\SmartPSS ) with a newer version. Shift the Playback Timeline

Follow these troubleshooting procedures in order from the easiest to the most advanced. 1. Force Close Stuck Processes via Task Manager