BackWPup broken?

This is my favorite backup plugin, but after the recent update it does’n’t work anymore at 6 different WordPress websites hosted by 4 different hosting companies. The problems differ from website to website. In most websites the settings give the problems. The screen is compleet blanc, I am not allowed, backup doesn’t work and so on.
Overal problem: Version 3.0.6 is not working.

Is it possible to go on http://wordpress.org/extend/plugins/backwpup/ back to the last version, until the problems are solved?

I hope my favorite plugin will work again!