Chrome v21 & Norton Toolbar Issue

I have having a very strange issue. If norton toolbar extension is enable sometime my page not load completely untill I open a new tab or switch between tabs. As soon as I open new tab or switch tab my page load completely.

 

I have tested it with many different ways. But When ever norton toolbar extention enable I have this issue.

 

Is this a known issue or there is any kind of fix for the same?