I have a new install of Knowage (Knowage-6.0.0-CE-Installer-Unix-20170623.zip). I cannot login. I receive Ooooooops! User or password invalid, Retry! This occurs with either a developer or admin userid (as supplied by clicking on either button in the Login dialog).
I have tried three different JDBC drivers as indicated in some problem reports. None seem to make any difference.
My OS is CentOS 6.8. My JDK is jdk1.8.0_131.