Same issue here. Went from 6.7.2 stable to 6.8. Pfsense vm stuck at 100% during initial boot. Went back to 6.7.2 for now. I do apologise for not having any diagnostics to help the cause. However, I did find something interesting during my troubleshooting. I suspected the issue was with the vdisks. Hence I started playing around with the vdisks and noticed if I create just a dummy file by using <touch vdisk1.img>. I was able to get pass the 100% hang state. Now obviously this won't work since that vdisk1.img is not really a vdisk but this test seems to confirm my suspicion. Oh well 6.9 will probably address it I am hoping.