This seems to be fixed now. Can you still see this happening anywhere?

This was definitely due to the theme settings needing resaving. It looks more consistent across browsers but I still feel they need a slight tweak.

There is another little issue I can see: When making the width of the browser window less than 845px, the table cell in which the Donate to Ubercart link resides breaks the display of the main navigation. See screenshot.

The problem might have been solved by giving the Donate to Ubercart cell an explicit width value, however, this causes the search input and submit button get broken onto 2 lines (this actually happens anyway if you resize the browser window to even smaller). This conveniently highlights a problem with using tables for layout; table cells are forced into vertical alignment so changes to the width of one cell will cause changes to all others in that column.

It's not a major issue but if I was building the theme myself I would make sure it was fixed. Other than changing the structure of the table (i.e. breaking the header out into 2 tables rather than 1), or dumping the tables altogether, you don't have that many options.

I've tested the front page in as many browsers as I could get my hands on and it seems fine (not broken any longer). See attached screenshots.

If there are any other issues you find and would like me to fix just let me know.