Hi, I had this issue for years, and recently updated to VW2021. Unforntutely the issue remains a problem for me, and now worse in some respects. In previous versions the issue was resolved by closing VW and restarting, but now it seems that won't help (I've tested a few different files). Wireframe it is ok, Open GL also ok, but when using Renderworks Exterior Mode it shifts the geometry of some of the extrudes (to the position they used to be) and now I can't get around it by restarting VW like I used to. See screen shots below where there is a gap in Renderworks mode that doesn't exist in wireframe or Open GL. Now I have to rebuild the blocks to get around it.