Hi Bob,
The JMRI web server has two methods of showing panels, the "frame" server and the "panel" server.
The panel server at /panel is the newer, more efficient method, as it draws the panel client-side and only sends state changes back and forth. Updates are immediate. This is highly recommended if it works for you. It requires WebSocket support on your devices.
The frame server at /frame actually sends a "screen capture" of the panel image, and tries to process mouse clicks based on position. Updates and refreshes are subject to a timer. This also works with some JMRI windows in addition to panel windows.
On old devices, there may be no WebSocket support (check?). If that is the case, you must change the Web Server Preferences to "Enable frames" and use the /frame server. That sounds like your situation.
Regards,
? SteveT
