Revert "Zero marks by GDEF for Tibetan" This reverts commit d5bd0590ae2fbc7b0dee86385a565aef00ffb835. The reasoning behind that logic was flawed and made under a misunderstanding of the original problem, and caused regressions as reported by Jonathan Kew in thread titled "tibetan marks" in Oct 2013. Apparently I have had fixed the original problem with this commit: 7e08f1258da229dfaf7e1c4b5c41e5bb83906cb0 So, revert the faulty commit and everything seems to be in good shape.