Update 5.2 to 6: Auth Exception, no login possible

This is my fourth try to update from 5.2.4 to 6.
After enabling the root account manually and disabling LDAP because that failed after update I'm getting now this exception:

04 Nov 2014 21:07:54,691 ERROR [faultExceptionMapper] [qtp1581218723-50    ] [] Exception while processing rest request
java.lang.RuntimeException: org.xml.sax.SAXParseException; lineNumber: 6; columnNumber: 3; The element type "hr" must be terminated by the matching end-tag "</hr>".
java.lang.RuntimeException: org.xml.sax.SAXParseException; lineNumber: 6; columnNumber: 3; The element type "hr" must be terminated by the matching end-tag "</hr>".
 at jetbrains.jetpass.client.auth.cas.AuthClient$1.onConnect(AuthClient.java:109)
 at jetbrains.jetpass.client.auth.cas.AuthClient$1.onConnect(AuthClient.java:101)
 at jetbrains.jetpass.client.auth.cas.Request.get(Request.java:62)
 at jetbrains.jetpass.client.auth.cas.AuthClient.validate(AuthClient.java:101)
 at jetbrains.jetpass.oauth2.server.AuthResourceOwnerValidator.resolveCurrentUser(AuthResourceOwnerValidator.java:53)
 at jetbrains.jetpass.oauth2.server.AuthResourceOwnerValidator.validate(AuthResourceOwnerValidator.java:36)
 at jetbrains.jetpass.oauth2.server.AuthHandler.handleOAuthRequest(AuthHandler.java:48)
 at jetbrains.jetpass.oauth2.server.AuthHandler.handleOAuthRequest(AuthHandler.java:25)
 at jetbrains.jetpass.oauth2.server.OAuth2RequestHandler.handle(OAuth2RequestHandler.java:18)
 at jetbrains.jetpass.oauth2.server.Oauth2Resource.get_Auth(Oauth2Resource.java:40)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 at java.lang.reflect.Method.invoke(Method.java:606)

And again no login is possible :-(

Any ideas before I give up with Youtrack?

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