Love this alpha so far, I've really only seen one thing that doesn't work as expected so I figured I'd mention it.
I've got a couple of bookmarks, when clicking on a bookmark the columns (type, runcount) I have selected disappear.
Issue found in 1.5.0.1290a (x64)
UI colomns not persistent
Re: UI colomns not persistent
What is configured in the Columns: field of your bookmark(s)?
(Menu:Bookmarks > Organize Bookmarks )
(Menu:Bookmarks > Organize Bookmarks )