I've recently been back in SL after several years of inactivity, and I've been experiencing an issue with some types of transparent prims showing up as red in my viewer. This isn't an issue with Ctrl-Alt-T. These prims show as red even when highlighting transparencies is turned off. I mostly see them in the snowlands as part of snow systems and at beaches as surface-type waves, though I occasionally see them in other places.
I run Firestorm with a graphics level between high and ultra. That's the default setting Firestorm gave me for my Nvidia graphics card. I remember in the past having