384.69 driver - screen and multiple sessions opened


I have a screen problem when multiple sessions are opened at the same time.
A black/white square appears around the cursor for all sessions except the first opened.
I use ubuntu 16.04.
My graphic card is the nvidia 940M.
I have the nvidia binary driver - version 384.69.
I haven’t this problem when I use an other driver.

Thank you for your help.

Anyone ?

I think it’s a bug. How can I report this ?


Thanks !