Ok, I did some poking around in the configure script and vsync.cpp, and it looks like USING_OPENGL_VSYNC is not being set.<br>
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Then I found this thread, which says the same thing:<br>
<a href="http://www.gossamer-threads.com/lists/mythtv/users/131589?search_string=OpenGL%20vsync%20problem%20with%200.18.1;#131589">http://www.gossamer-threads.com/lists/mythtv/users/131589?search_string=OpenGL%20vsync%20problem%20with%200.18.1;#131589
</a><br>
<br>
I'll give it a shot and post how it goes.....<br>