Hi Christian, Thanks for your reply: Pt 2) LUBUNTU CD boot - not an option at this time - UAT / production Xen0 with other non Windows PV VMs running on them. Pt 1) Yes I can do some additional testing on a different R620 Xen0 / Xenial platform. Currently I can cause/remove the issue by just installing the 10.21 and 10.22 versions. This can be done live / without a reboot of the base Xen platform. From other testing I can tell you the recovery ISO CD is very slow to boot, but it did complete to initial screens previously (although I couldn't tell you exactly which of the newer versions of QEMU that was on). I can build an clean image from ISO fairly easily - do you have a preference for Windows 2008R8 vs Win7 Pro ? I believe it is the same issues, but most of my immediate issues are with Win Server VMs. I also have a Trusty system with the same issues - does that add anything if I can run tests on it? Finally (slightly dumb question) does the DBG version of the DEB (.DDEB) provide any additional information / crash reports - is that worth installing? Do you want me to work with .22 or the proposed .23? We can probably run development cuts from PPA, cut need a bit of risk control work at my end. @Marc - Does the BSOD screen shot / address / Windows MEM Dump file stuff give you anything? Regards, Carl -----Original Message----- From: