What do I need to do to get error indicators to update when I save? I enable
checkstyle for a project, open a source file, the checkstyle errors are
shown, I fix an error and save, but the error indicator does not go away.
The error indicators will be updated if I disable checkstyle for the
project, then re-enable it or if I rebuild the project, but that is time
consuming.

Eclipse version is 3.1.1.  Checkstyle plugin is 4.0.92. I'm having the same
issue with other combinations, though. OS is Windows 2000, SP4.
Incidentally, I set this up on Windows 2003 Server and the plugin works
fine. Someone at work is using the same plugin, on Windows XP and it works
fine. But upgrading to XP is not an option.