I have a tabpanel that contains a panel, which at his turn contains a dataview.
The aplpication starts with this tab. The first time, all is ok.
However, when I navigate back to that first tab (the dataviewpanel is refreshed each time the tab is activated), I get an error in LoadMask.js at line 309.
Apparently, owner is undefined, so changing
if (!me.disabled) {
if (!me.disabled && owner) {
solved the issue.