We are using the OOBean in Eclipse for visualizing and editing documents. 
When we perform a toolbar button action, let's say 'Save', which we handled for 
saving AND closing the document and disposing the frames. When, however at this 
exact time a tooltip text for whatever toolbar button is being displayed, 
Writer just freezes.
This behaviour is very event-bound, so if the tooltip is shown at the exact 
time the document is being closed, so sometimes we need to try several times to 
reproduce. On older (slower) machines, we get this behaviour quite more often, 
almost 1 time out of 2 tries.