I have the problem to logon my Lxadmin panel of VPS.
I tried upgrading, restarting, still can not logon.
Later I find the way to reset password. It is good enough to solve my problem.
The original administrator user is admin, I just reset its password.
Try resetting the admin password to [newpassword]
lphp.exe ../bin/common/resetpassword.php master newpassword
Bingo, I logged on the Lxadmin successfully.