Good information, but there is another solution to copy/pasting the whole drawing into a new drawing if the text gets messed up after 3D orbit. The problem isn't actually with 3D orbit, it's that panning while in the 3D orbit command moves the "target" of the view, and if the "Target" isn't at the same Z position as the TrueType font then smoothing (anti-aliasing) is disabled. This is the same reason TrueType fonts with z-values other than 0 (relative to the view) display jagged.
To correct the problem, use DVIEW to reset the z-value of the view to 0.
Here's a macro that will reset the view, which I've assigned to a button to quickly reset any view. ^C^C_.Dview;;_Point;0,0,0;0,0,1;;