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I have twice had changes I have made in the Options screen get forgotten after a restart of the IDE. The particular change I made was to associated the file extension ".agent" with the xml object type. This has been forgotten on 2 occassions. In contrast, another options change, to view file extensions in the explorer, has been remembered after restart.
Using property editor I have added "xul" and it's persistent.
build 040806
Verified