One of my modules has decided to stop writing Trace log files. I have unchecked the "turn off tracing..." box as I always do but to no avail. Is there anywhere else I should look for a setting I may have inadvertently deactivated? This is OD 6.0

Setting the ddrt.properties file for a module has no affect on that module's tracing, which means the "Turn off tracing in deployed application" setting when you export does not apply. The Parent app with modules will also log trace and report information in its log for the modules as well as itself, but nothing will get logged in the module’s trace or report logs.

If you working in simulation, I would suggest taking a look at those settings. They are located under:

Eclipse Preferences -> Avaya Aura -> Application Simulation -> Orchestration Designer Simulation

The details of what each item there does is found in the Dev Guide, but mainly the first three deal with writing trace.log files and changing the contents of those files.

The ddrt.properties file setting was the answer! Many thanks once again.