I have found that when running Version 2.11.0/2.12.0 (maybe other v2.0 versions are the same) in fullscreen mode using Autohide, that if one for example opens a Folder, well all the FD cells in that Folder vanish.

If one returns to non fullscreen mode, the cells will re-appear

This will also occur with cells in the root folder.

It is in the transition from one folder to the next that the cells go missing.

It is possible to remain in fullscreen mode in a folder after non-fullscreen mode and the cells remain visible

If one is in a folder in fullscreen mode with visible cells and one refreshes the Fast Dial page, all cells will disappear.

For information concerning Autohide see here:
Running Fast Dial in Full Screen Mode

This problem does not exist in Fast Dial v1.x