Later on today I will be releasing the next update of my Fun with Sidebar Tabs plugin.
Most changes are not noticeable; for example, I have updated the way that some WordPress files are loaded, and the way that tab layers are calculated.
Some changes are noticeable though. I’ve made a number of changes to try and deal with the problems that some people have been having with CSS specifity, i.e. that the styling of the tabs was being overridden by more specific CSS rules in the theme stylesheets.
These changes might mean that rules that were previously overridden will now apply, and so it might be necessary to tweak the CSS that applies to each sidebar if you have made changes that differ from the defaults.