I have an even worse problem:
When I publish jbmaps in an Organica template slider, everything works fine in Chrome, but it completely prevents the site from displaying (blank page) in FF (Ubuntu 10.04 & OSX), Opera (Ubuntu) and even Safari (OSX) (I haven't tried IE yet)
The problem seems to revolve around the Google API: I've tried Gmapz instead of jbmaps and the result is the same - except it doesn't work in Chrome either, and in all cases the browser says it's waiting for Google.
This isn't critical for me since at this point I can simply use a picture instead of an interactive map, but I thought you'd like to know.