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Use the attached heap dump (if collabnet will allow the attach - if not send me an email and we'll work something out). Open the .hprof file in the Heap Walker. Type in "Voice" in the class filter control at the bottom of the window. You will see several classes listed. Right-click the entry for com.sun.speech.freetts.Voice and choose "Show Only Subclasses" The display redraws to show the correct list of classes. Remove the com.sun.speech.freetts.Voice entry from the Class filter at the bottom of the window. The display redraws to show all classes. Type "Voice" again in the class filter and press Enter. The display redraws and is incorrect - it shows no classes at all. Have to restart the IDE to get the correct display....
Looks like the "attach" didn't work because the file is too large. Does not matter, though, this is not really a bug. It is instead a usability problem. When I removed the fully-qualified name for the Voice class, the filter setting did not get changed back to its default which is "Contains." In other words, it stayed at "Subclass of." This is why my subsequent attempt to enter "Voice" did not work. The filter had been changed to "Subclass of" by my usage of the context menu entry. And since "Subclass of" requires a fully-qualified class name, the search results are empty. Not sure what the change should be. I'm tempted to suggest that maybe when the user clears the class filter control, the filter should be changed back to the default.
"Clear current filter" button now also resets filter type to the default (Contains). Although I don't think this is exactly correct based on what the button was originally meant to do, it could prevent confusion for users who haven't realized that filter type can be changed. I'm afraid that change will probably lead to another issue "Don't clear filter type, just the filter value" which would mean that the filter component needs to be redesigned. Fixed for Beta2.