Flashing/Black AV problem on Mac

I'm running an Intel iMac with the most recent SL code. My AV will either appear completely black or as a series of flashing, random images. I'm able to get the AV to look right from my PC and then I was able (once) to reinstall SL on the iMac and the AV looked right. As soon as I tried to change appearance or clothing, etc. the problem started again.

I've tried the rebake, prefrerences, etc. suggestions with no change. I've also tried the First Look Viewer for Mac with no change.

Any ideas?

I Posted the following back in Oct 2006. It might be similar to your problem.
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If you have a Macintosh with dual monitors this is your problem.

Basically it starts with the AV's clothes turning black or various textures being picked up from the surrounding area. Then the whole avatar turns black except hair and selected objects your're wearing. If you go into Appearance mode the avatar and all the avatar pictures would sometimes pick up random textures and would cycle though them. Appearance mode becomes unusable.

I put in two bug reports to Linden about this
""All my clothers look black or quickly change random textures" has been received, and assigned an ID of [rt.lindenlab.com #435509]. "


Linden finally acknowledge the problem and found a work around
It's under Support: Known Issues
URL: http://secondlife.com/support/known-issues.php

SL-19065: AV Texture Baking on mis-aligned Mac dual montiors results in black AVs!
Setup: You need a Mac with a second display to repro this bug. - (Apple Menu) > System Preferences > Displays. - Click 'Arrangement'. - Drag the Secondary display (without the menu bar) on top of the Main display (with menu bar). - Uncheck 'Mirror Displays'. - Close System Preferences. - Log in to Second Life. - Move the SL viewer window to the Secondary display. - Right-click your Avatar > Appearance... * Observe: Your avatar is jet black with no features. The preview graphics in the Appearance window are also black. * Observation note: On previous versions the GL previews would be distorted/'spikey'. - Move the SL Viewer window to the Main display. * Observe: Your avatar is no longer jet black with no features. = Workaround: If you saved your appearance in this jet black with no features state, resave it on the Main display.

I now run the SL in my main display and it's back to normal.
Hope this helps