Ourph said:True. However, Glassjaw has spent, at most, ~4.5 years playing 3e. I played a weekly B/X game for nearly 11 years without feeling any burnout (with only rare occasions of the others thrown in). I guess what I'm saying is that everybody has their own particular tastes.
It is possible that it is a matter of tastes. It seems equally likely that it is a matter of tolerances. Two people may like exactly the same things in a game, but one may be able to tolerate a steady diet of solely that game for longer than the other.
Add on top of this that we don't know exactly what in his game has grated on Glassjaw. Maybe it's the rules. Maybe it's an aspect of how the plot has always run, or of how the other people play. Maybe it's the fact that he's usually only had a couple other people, maybe it's a combination of these things, or maybe it is something else.
The basic solution remains the same - for a while, change the game you're playing in some way.