Look at the zorder= entry for [window12] in the panel.cfg for starters. In fact you may want to add them if they are missing as each panel.cfg is slightly different.
The other cause is the gauge.cab itself. It's been updated. There's an update along with the panel fixes on their website, and according to their forum it looks like a Service Pack 1 will be released soon.
Although I've been able to get it stable on my setup, some are still having problems so hopefully the service pack will fix all.
--WH