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Signal Changed Events Not Firing

Hello,

Are there any situations in which the signal changed events stop firing? I occasionally get into a state where my PC SDK app stops receiving signal changed events and the only way to get things up and running again is to restart my application. I believe this occurs when the Rapid code receives some timeouts, but I have yet to nail down a specific scenario.

All of the signal changed events are routed through a single handler routine. In this state, changing the signal values within the 'I/O System' window does not cause the event to fire. Any ideas? Thanks.

Info:
 RS 5.15.02
 PC SDK 5.15