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https://www.ptc.com/appserver/cs/view/solution.jsp?source=subscription&n=CS108170
The above document about memory leaks says the problem is fixed in WF4 M230, however, there is no WF4 M230. WF4 M220 came out in Feb 2012 and WF4 has been taken off active maintenance. Anybody know if PTC are actually planning one more WF4 release?
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