Hi again Andre I am learning towards the assert being right. It appears sub-classes will be placed on 64bit aligned address on Win x64. This breaks some assumptions on how arrays are layed out. I will have to check where we make use if the assumptions asserted here, and see how bad it is. Note, we normally don't enable LLInt on Windows64. By disabling JIT though you have forced it to use the fallback CLoop LLInt, so that might be why we haven't run into it before. `Allan > _______________________________________________ > webkit-qt mailing list > webkit-qt@lists.webkit.org > https://lists.webkit.org/mailman/listinfo/webkit-qt _______________________________________________ webkit-dev mailing list webkit-dev@lists.webkit.org https://lists.webkit.org/mailman/listinfo/webkit-dev