Hi Jeremy, Sure, #02132179. Just to summarize, the support team made a remote connection to my machine (AMDFireProV5800) to see what was going on and found the following: In Direcx mode the geometry looked like this allways: In openGL mode the problem stoped when triple buffering and vertical sync options were turned on in the driver settings panel. Later I reset driver options to default and the problem went away even with the triple buffer and vsync options off (??). After the support assistence session I found that the problem allways occurs when I used a procedural symbol called "Stacked Blocks" I've tested on a pc with a AMD Radeon HD7700 (with two driver versions) and the problem occurs only in openGL mode with the "Stacked Blocks", directx is fine. Using latest ArcGISPro version 2.2.1 now. No reply from AMD support yet. Thanks
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