GDI Texture

I’ve noticed this before, and its just happened again, sometimes, dont know the full circumstances, the gdi texture that I have doing text on some interfaces, wigs out and I get a white quad instead of text, ie the texture outputs all white.
Its certainly did it the other day when I changed the type and format options, and only reloading the patch fixed it, today I loaded a patch that works fine on another machine, (one with a ati which may make a difference?) and got it again (nvidia)
Having said that it happened on an ati the other day…