Last night we posted a new version of the KJVS - King James Version w/Strongs. This update fixes problems with duplicate Strongs numbers not being displayed (where 2 Strongs numbers are given for a single word in English.)
In addition, this fixes the problem with highlighting red letter verses (although there are still a few verses that will have trouble -- just a handful, really.)
Just delete your current version and download again to get the new version.