I tried the 4.30 version and it seems that the link insert function fails. When I click on the icon to insert a link, the screen goes transparent white, like the background for a lightbox, but that's all. No lightbox or popup appears, and actually WB freezes. You have to remove the last part of the url to access the admin again.
Can anyone confirm this? I tried the latest versions of IE, Chrome and Firefox. I must admit I run WP 2.8.1 on that site, so maybe it works on WB 2.8.3. I will try that on another site. But 2.8.1 is not really obsolete or something, so you would expect it to work fine.
OK, I tried it on 2.8.3 as well. Now the popup appears, but it doesn't work in IE11. Firefox and Chrome are allright, but in IE11 the buttons are not working, and also the hidden, dynamic parts of the popup are visible. So you see the insert email link part of the popup right away, even if you don't choose to do so.
So all in all, the module is rather picky right now.