Playback accuracy help

[endemic]

From time to time my machine will act up w/ PT 8 and change some of my settings around.

Just curious if anyone knew how I can align playback to start exactly on the grid when I hit play and not preview the bar before (even in 1/64 grid mode)? Right now, it seems to be previewing the bar right before my highlighted grid in playback.

Note: I trashed my Prefs, do not have timeline insertion/play start marker checked, pre-roll/post roll is off, and am in grid mode. When the highlighted bar loops back around, it does plays from the start of the grid, just not when I initiate playback start. Strange.

Thoughts/Advice?