SQL 2012 SSISDB catalog - read permission on folder, but still can't see it

Hello,

I've set up the SSISDB catalog, created a folder X, granted all the permissions to a specific login (windows group) - read, modify etc. Didn't make it a member of the ssis_admin role though (I want that login to have full control just for that folder).

The problem is, members of that windows group can't even see folder X in SSMS or via catalog.folders view. Any ideas?

Thanks.