EndNote does not show library items

Hello everyone,

after switching to a new Mac and transferring my EndNote library, unfortunatel when I want to insert a citation, I can search for the item in the list and Word/EndNote finds the item (as it shows the information of the item), however it is not shown (Screenshot “Hidden items”). 

When I click on cancel and repeat the process, then the items are shown in the list (Screenshot “After cancel and reopen”). 

Does not seem like a big problem, but it can be a little annoying with time.

Edit: It also shows the list once I start “scrolling”. The window is blank, until is start scrolling down, then the items appear. 

I have already tried it with EndNote X8, same thing.

I would greatly appreciate any help!

Best regards