please try again

Hello, I'm not able to login to PVE, when I try to login I have the following error message: Error: Login Failed: Please try again. I'm able to login using SSH and all VMs are working as usual. Any ideas? Thanks! root@prox1:~# pveversion -v proxmox-ve: 4.1-41 (running kernel: 4.2.8-1-pve)...