Layer tool doesn't show layers.

[Tyanne]

Hello all

Please be patient, English is not my first language and it's complicated to explain this issue.
Also I am a new user so I'm trying my best, excuse me if the question seems silly to you...

I use ArtRage Lite (last full version) with a One by Wacom tablet, and Windows 10.
Today my "layers" tool does not work at all anymore. I was working on my project and all the layers in the window disappeared.
Now I have the same issue in all my saved projects or when I try to start a new project..

When I click on the "Layers" button on the right, instead of having a small window with all my layers,
I have a very tall, white and empty window. I don't have access to any of my layers in any of my projects. If I start a new project, it's the same thing.
The + button at the bottom of the window has disappeared. I closed the program, restarted the computer, uninstalled and reinstalled the program.
I am not sure where to look to find a solution, if anyone can help with this issue I would really appreciate it.

Thank you very much,
Tyanne