My 2.5.0 and 3.0.2 installs both behave as you have described.  Event does not clear when clear event is sent via REST (wget in my case).  I feel like I've been down this road before but I can't figure this out.  I tried using different eventclasses, adding a message.  No luck. Anyone??
Original link: http://community.zenoss.org/message/54836?tstart=0#54836
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