BP site display is garbled on my admin computer but not on other computers

This did not start happening until after I upgraded to the latest version of Studio, but that does not mean this is the cause of the problem because I thought the site looked OK until yesterday.

You can verify that the site looks properly by checking edberry.com. But on my admin computer, the display on all pages looks like the attached file.

I cannot cure this problem by rebooting or by logging out. I have gone through all the settings and I find nothing unusual.

I will appreciate any ideas.