In Design, hidden characters not showing, help

[dogbone]

I'm in normal view mode and I've got a text box selected and "Show Hidden Characters" selected from the type menu but the hidden characters are not showing.

Why?

[dogbone]

After trying to work it out for half an hour it turns out that quitting and restarting Indesign has made it work again. (that was the gf's suggestion, that I thought wouldn't work:))