https://forums.autodesk.com/t5/autocad-forum/need-to-double-click-now-to-select-objects-since-upgrading-to/m-p/5753702#M318666 <P>Hi,</P> <P>&nbsp;</P> <P>welcome @Anonymous.autodesk.com!</P> <P>&nbsp;</P> <P><EM><FONT color="#000080">&gt;&gt; is there&nbsp;incompatibility &nbsp;issue with windows 8.1?</FONT></EM></P> <P>...in relation to which AutoCAD release?</P> <P>AutoCAD 2010 isn't supported on Windows 8.1</P> <P>&nbsp;</P> <P>But as long as AutoCAD itself works I would see the source of the issue more at the mouse hardware or driver or driver settings (especially when a mouse has more buttons than a human has fingers there are a lot of config options).</P> <P>I would suggest: get another mouse (another type/vendor) and try that.</P> <P>&nbsp;</P> <P>Good luck, - alfred -</P> Mon, 03 Aug 2015 08:31:09 GMT Alfred.NESWADBA 2015-08-03T08:31:09Z