xymon graph and browser issue

I don't recall seeing this issue mentioned, but I may have missed it/not found it while searching.

If I look at a system graph, say CPU, in Internet Explorer, then when I click on the magnifying glass and zoom in, it works fine.

But if I try that in another browser, say Mozilla or Chrome, then I just see a graph with a big blue block where the picture should be.

This is with xymon 4.3.0-0.beta2.

Thanks, Taylor