issue with media library after upgrade to 4.9.0

Hi,

I upgrade my Umbraco site from v4.7.2 to v4.11.2.

All went fine except for one issue with the Media Library since I upgraded to 4.9.0.

When selection the Media section in the Backoffice, the Media Library shows some jquery animation, that keeps spinning

When I folder is clicked in the content tree of the Media Library, the content is shown as normal. It's only when in the root of the Media Library that thes jQuery animation keeps spinning.

Anyony encountered this before?

How did you solve it?

Thanks for your help,

Anthony