Manage Gallery Images

Hello,

I’ve a big problem with the Gallery Images Section.

Upload Images from Computer works (Drag’n’Drop and then just “Save all Changes” + closing and after “Update Gallery” the image appears in the preview.)
Upload Images from url oder existing Media doesn’t work (can’t mark it or anything else)
Manage Gallery doesn’t work because deleting an image means deleting it from existing Media.
So how to fix this?

Another problem:
For the [property_overview] I’ve set Thumbnail Size to medium 300x300px in the Display Tab. Why is there no nice image fit (with crop if an image is portrait or landscape?

Thank you.