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Swing app client enterprise application. If a breakpoint is set which is activated by the drop-list of a JComboBox, then NetBeans and the whole X-Windows GUI become unresponsive. The user has to use CTRL-ALT-F1 to get to the Linux text console, log in as root, do a 'jps -l' to find the offending app client runtime and kill it. This 'frees up' the GUI and X-Windows (along with NetBeans) can be resumed by presing ALT-F7. As you can imagine this makes debugging ComboBox related issues very difficult. Note that the CPU is not busy during this 'freeze' as the 'top' command does not show the offending java process taking up any time.
By the way, even though I have put down version 6.7 above, we have had this problem since version 6.0.
*** This issue has been marked as a duplicate of 93076 ***
Verified ... and Closing all issues resolved into NetBeans 6.7 and earlier.