Is there a reason you left your comment blank, Omke?
Can't think of any valid reason except this dreadful new forum format does not seem to work correctly with email. If I don't use a quote it is almost certain to end up blank, this one I used on email via iPad which does not seem to work either. I almost always use email and for some reason I have to sign in every time again per day because the forum did sign me out automatically. It is very hard to keep positive in this way…
Here is a copy of my previous answer, hope this time it works:
4. "Preferred Embedded (Faster)" thumbnails selected whose icon/dropdown menu can be seen when Bridge's "Path Bar" is turned on under Bridge's "Window" menu (Film Strip mode in my case).
This setting is only useful for quick viewing of the folder content, every time you select a file in the content window it starts building a HQ preview (the thumb builds also correctly and the black border disappears).
Use always HQ for being productive with Bridge.
Also be aware Bridge is very processor and graphic card demanding. It states a minimum of 1 GB Ram but with only this it is in fact unusuable, you will profit from more RAM ( max out if possible, RAM is very cheap)
Be sure to have enough free space left on your disk, minimum is 15 %
Also be aware that CC 2014 needs the minimum of OSX 10.7, it will not work on your system!!