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This issue is rather random. Open the appserver server log, minimize the output window and then maximize it again. Sometimes the appserver log tab disappears from the output window - the log is not there anymore. I was able to reproduce this couple of times with the appserver log, but didn't manage to reproduce it with any other server output nor build output, therefore I am filing this issue against the appserver.
root cause is that when the tab is closed, we close the file to release it. It seems that close or minimize actions are the same at the API level, so there is no way for mw to detect the minimize state to no clean the file stream...
This is similar to what I am seeing while investigating 63907, so I will close it as a dup. My fixes for this will be part of the fix for 63907... *** This issue has been marked as a duplicate of 63907 ***