<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">I changed my CPU from one that supports VT-x to one that doesn’t, now none of my virtual machines will run<div class=""><br class=""></div><div class=""><p class="">Failed to open a session for the virtual machine <b class="">Tiger</b>.</p><qt class=""><p class="">VT-x is not available (VERR_VMX_NO_VMX).</p><table bgcolor="#EEEEEE" border="0" cellspacing="0" cellpadding="0" width="100%" class=""><tbody class=""><tr class=""><td class="">Result Code: </td><td class=""><tt class="">NS_ERROR_FAILURE (0x80004005)</tt></td></tr><tr class=""><td class="">Component: </td><td class="">ConsoleWrap</td></tr><tr class=""><td class="">Interface: </td><td class="">IConsole {872da645-4a9b-1727-bee2-5585105b9eed}</td></tr></tbody></table><br class=""></qt></div><div class=""><qt class="">I edited the .vbox-prev of the virtual machines, and added:</qt></div><div class=""><qt class=""><br class=""></qt></div><div class=""><qt class=""><HardwareVirtEx enabled=“false”/></qt></div><div class=""><qt class=""><br class=""></qt></div><div class=""><qt class="">But every time I launch VB, it overwrites the settings, removes <HardwareVirtEx enabled=“false”/>.</qt></div><div class=""><qt class=""><br class=""></qt></div><div class=""><qt class="">I can’t access the Acceleration tab in VB, it’s greyed out, but it must have the VT-x checkbox checked?</qt></div><div class=""><qt class=""><br class=""></qt></div><div class=""><qt class="">Is there some preference file I need to delete?</qt></div><div class=""><qt class=""><br class=""></qt></div><div class=""><qt class="">macOS Sierra 10.12.2</qt></div><div class=""><qt class=""><br class=""></qt></div><div class=""><qt class="">VB 5.1.14 r112924 (Qt5.6.2) </qt></div></body></html>