You might send a note to Liz Courter at Marketo about this. There are a number of known issues with Badeville that she is actively working to get fixed. You may may want to make sure this one is on her list too.
Our developers have fixed the issue and you shouldn't have any more going forward with saving bookmarks. If you'd like us to try and restore your old bookmarks from our last back up, please email me at email@example.com.