I think if you are an occasional user of ie then roll it back, if you simply must use ie11 then as John suggests; use a third party ftp, filezilla is free and In my opinion the best one out there. Also if you are updating files a lot (and I mean a few times a day) then the ftp in xara is very good, if however you are only occasionnaly doing so then use filezilla - or wait till the guys at xara sort it out.