Just upgraded to 3.51 (trial), Win2k, en_US.
Syntax highlighting problems persist. It seems that comments are causing the largest share of the problems.
I have attached a screenshot to illustrate the problems. The only difference between the first (correctly highlighted) screen and the second (incorrectly highlighted) screen is one line of scrolling. When the comment terminator scrolls off-screen, the syntax highlights incorrecrtly. When that line scrolls back into the visible pane, it correctly highlights the syntax.
See attached.