I've found this bug after reveiwing http://issues.alfresco.com/jira/browse/ALF-7346
Steps to reproduce:
1) Make sure that your monitor resolution is 800x600.
2) Create any site in Share and upload more than 400 files to Document Library;
3) Open the folder containing the documents and change page to display the documents using the top menu (screenshot attached);
All pages are clickable/accessible.
"show folder"/"hide folders" button makes some actions unavailable.