Broken Eclipse syntax highlight behavior for PHP

The initial syntax highlight when opening files looks fine, but after editing a few lines, syntax highlighter fails:

FYI I'm also using Eclipse Theme Plugin. Any idea?

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Update (Feb 20, 2011): Here is the unloved bug issue.

Update (Jul 1, 2015): The issue has been marked as开发者_开发技巧 resolved today after about 4 years! The resolver says that it was because of model synchronization.