Do you have try with the last version?

Regards

Tony

Local fix in grid.base.js:

Line 1216:        

...

var setColWidth = function () {
     var initwidth = 0, tblwidth, brd=0, l, vc=0,scw=5,cw,hs=false,aw;

...

Line 1267:

...

var getOffset = function (iCol) {
            var i, ret = {}, brd1 = 0;

...

P.S. This is quick fix and perhaps it makes offset calculation invalid when grid is placed not on IFrame, but for our project it's ok for now. It would be good if all width calculation will be correct not depending where grid is placed. Or at least if these offsets will be manageable from code.