Access 2010, Win7Prof 64bit.
In forms or report textboxes, using any theme or individual textbox fore and background parameter choices, when I tab to any field the high lighted text has overlaid a vertical striped rainbow of colors. The default background is black and the letters are rainbow colors.
Turning off TrueType does not help. The effect is the same on an HP Win7 and a Dell Vista PC with different graphic cards. See attached jpg.