id summary reporter owner description type status component version resolution keywords cc guest host 16968 When starting two VMs at same time, one regularly aborts BBoyar pentagonik "Version 5.1.26 r117224 (Qt5.6.2) Running on Win 10 Pro 64 bit, 32 Gig memory in box typically 50-70% available when this occurs. Invoking two VMs at the same time results in one of them 'aborting' about 90% of the time. This is a much higher failure rate starting with this version of VB than in previous versions (very rare...MAYBE 1% of the time) problem independent of whether invoked from Manager or command line problem independent of OS running in the client VMs (typically Win 10, or XP) " defect closed virtual disk VirtualBox 5.1.26 fixed Windows Windows