When I search for something in the MATLAB Documentation Center, I sometimes see the results of my search, but sometimes the actual results do not display. I can see that there are results in the "refine by ..." panes on the side. Sometimes if I refine by product or something else the results will appear, but other times a little "wait for it" symbol (vertical boxes moving to the right) will appear and disappear as if they are loading, and they will remain absent. Here is a screenshot of a search with results that are not displayed. You can see that it thinks it is showing me results 1 to 10 of 29.
I'm using Matlab R2017b on a Red Hat Enterprise Linux Workstation Release 6.10 (Santiago), Kernel Linux 2.6.32-754.2.1.el6.x86_64, and GNOME 2.28.2.