Character formats turn on change bars

Hi all

My colleague has noticed something very strange in Framemaker 12. He's created a new character tag, applied it, and hey presto, a change bar appears.

We've checked the character designer, and Change Bars is not selected for that character style.

This only seems to happen for styles that he's created recently.

When he applies the default font option, the change bar disappears.

Anyone got any ideas?

Thanks

Laura