To reproduce this bug perform the following steps.

Run the SwingSet demo in appletviewer on Windows NT. Pick the Progress Bar tab and have the applet "Start Loading Text." As it types, go to the appletviewer menu and issue a stop command. If you restart or reload the applet after this stop, the panel under the ProgressBar tab never recovers; the painting thread seems to be halted. The applet continues to run, but the ProgressBar demo is completely hosed.