That regression started in 5.3 I think, still in 5.4, ETA on fix?
bug# 778067
Given that all you said in the report is that there are ‘artifacts’ under GLCore, and there’s no repro project attached to the bug, and no screenshot, and no reproduction steps, and I just tried creating a particle system under GLCore in 5.4b3 and it looks fine to me… I think the ETA is “never, unless you actually give us some information about the problem.”
check 774724, 774907 and browse the forum for shuriken billboard streaking across screen
OK, I see that 774724 and 776317 between them have a screenshot and repro project, and are awaiting reproduction by QA.