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Do the rest of the health bars still work? If so, it's not the textures because they use the same bit depth, etc. What about the cast bar in the unit frames themselves... does that one also turn black, or only the one in the HUD.
That said, the fact that you use Linux has nothing to do with the fact that Blizzard's video drivers have a bug. You're confusing the video drivers in WoW with the video drivers in the operating system... not the same thing. Nor does it have anything to do with frame rate. It's about how "custom" textures are rendered versus the built in secure textures.
Are the textures *always* black no matter what, or are they sometimes normal and sometimes turn black? Are you running in a full screen graphic mode or a windowed mode? When they are black, if you do a '/nui rl' without tabbing out of the WoW window, do the textures return?
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