Mouse-Over causes jumpy category tree

This is a bug that I haven't gotten to the root of. Any help would be appreciated.

hmmm, don't understand, compared
geobrowser-5.x-1.0\geobrowser and
geobrowser-5.x-7.0\geobrowser
by content in total commander and find no difference!?

copy
geobrowser-6.x-1.x-dev\geobrowser\controls\tree\js\dhtmlXTree.js
to
geobrowser-5.x-1.0\geobrowser\controls\tree\js\dhtmlXTree.js
and the jumping menu disappears...

or delete line 834
td2.onclick=this.onRowSelect;td1.onclick=this.onRowClick;td2.onmouseover=this.onRowClick2;
and add:
td2.onclick=this.onRowSelect;td1.onclick=this.onRowClick;
//td2.onmouseover=this.onRowClick2;

delete line 1262
td3.onclick=this.onRowSelect;td3.onmouseover=this.onRowClick2;
and add:
td3.onclick=this.onRowSelect;
//td3.onmouseover=this.onRowClick2;