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I20120208-2200 1. Window > Open Perspective > Other... > Java > OK 2. Window > New Window 3. Window > Open Perspective > Other... > Debug > OK 4. The debug toolbar is now visible. 5. Window > Open Perspective > Other... > Java > OK 6. The debug toolbar is still there.
Confirmed that this is, in fact, caused by Bug 320478.
I have a fix for this that will go in Friday. In essence we where calling ActionSetManager.hide and show too aggresivley leading to problems with its reference counting.
Released http://git.eclipse.org/c/platform/eclipse.platform.ui.git/commit/?id=3c1651e601a887c1fa955c4b43fbe0ef658d6723