There's no banner notice when you bump a thread using the Bump Thread button at the bottom, when you bump a thread using the bump control at the top, you get a banner confirming the bump.
I’ve notice that. I wish they would offer a “bump selection” on the watched threads main page. So you can bump your thread without opening each one separately. They could add a selection “bump thread” in the menu list along with the ...“stop watching”, disable email”, etc.
I don't know if that's possible with the current software, but you should post that over in the Suggestion Box. It's a good idea.
My main issue was that I thought there wasn't any feedback when you pushed the bump button, I now realize that the button changes to include a countdown timer once the thread is bumped.