I found a bug/problem in... hmmm, maybe it is IE8 (lower & higher versions of IE not tested). In admin panel I cannot create a new page, because the submenu does not appear. Only by Pages! Orders, langs, files, all their submenus appear without problems. In FF no problems with Pages. I changed the div id from "p" to "pag" and it works. I tried to change the "p" to another letter "r" it works. Only, if the div id="p" the submenu "New Page" does not appear in IE8. In older QC versions: no problem with "p" & IE8
I suppose, i've got it. Some lines before <ul id="menuBar"> in QC3.7 a new functionality has been added: the Search fieldset. one of the inputs has a name "p" I know, it is not id, but it seems (just tested changing its name) that the IE8 cannot deal with this.