When I open the Add-on Explorer, it only shows a blank window. But if I move around the cursor, it does change its look (from 'Normal Select' to 'Link Select', as the picture shows) at some places.
Besides, Add-on Manager shows the same problem, while the 'Package App' window works fine. I tried reinstall MATLAB, but the problem remained. (I'm using MATLAB R2018a on Windows 10 64-bit) Recently I used an extended monitor, and I wonder if that's the cause of the problem. In case there is no solution, can I install a .mlpkginstall file manually?