@ Global Cultura
Yes, it appears that is a bug. Thanks for bringing it to my attention! I have it fixed and it be released in the 0.8.14 bugfix release.
As for the image upload… there is no upload button, there should be a button to choose and image from your computer. If you do not see this button, make sure the metabox is not collapsed… click the arrow to the right of the metabox title.
Hope that helps!