Update to 6.20.1 Rev5 fail on Ubuntu

[fmhermo]

I had a working OpenXchange 6.14 server on Ubuntu 10.04. It is set up for Spanish language. I've just updated to 6.20 Rev5 and now login gets stuck at 90% on every browser (IE, Firefox, Chrome).

Has anybody gone through this problem?

Thank you

This is what I can find in the logs:

Feb 1, 2012 10:39:21 AM com.openexchange.login.internal.LoginPerformer logLoginRequest
INFO: Login:felipe IP:172.15.1.241 AuthID:93c5e5ac-b10c-4dd3-8abf-ee427a800000 Agent:Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.2 (
KHTML, like Gecko) Ubuntu/11.10 Chromium/15.0.874.106 Chrome/15.0.874.106 Safari/535.2 Client:com.openexchange.ox.gui.dhtml(6.20.1 Rev
5) Interface:HTTP_JSON Context:1(1,defaultcontext) User:27(felipe) Session:3cca8bc4ec00483aac0fe5848abaf08c Random:8357a9742bef4ca4836
2f880050aeee4
Feb 1, 2012 10:39:22 AM com.openexchange.ajax.AJAXServlet service
SEVERE: null
java.lang.NullPointerException
at com.openexchange.mailaccount.json.writer.MailAccou ntWriter.writeArray(MailAccountWriter.java:158)
at com.openexchange.mailaccount.json.actions.AllActio n.perform(AllAction.java:103)
at com.openexchange.ajax.requesthandler.MultipleAdapt er.performRequest(MultipleAdapter.java:107)
at com.openexchange.ajax.Multiple.doAction(Multiple.j ava:214)
at com.openexchange.ajax.Multiple.parseActionElement( Multiple.java:173)
at com.openexchange.ajax.Multiple.doPut(Multiple.java :125)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:619)
at com.openexchange.ajax.AJAXServlet.service(AJAXServ let.java:413)
at com.openexchange.ajax.SessionServlet.service(Sessi onServlet.java:219)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:689)
at com.openexchange.ajp13.najp.AJPv13RequestHandlerIm pl.doServletService(AJPv13RequestHandlerImpl.java: 523)
at com.openexchange.ajp13.AJPv13Request.response(AJPv 13Request.java:134)
at com.openexchange.ajp13.najp.AJPv13RequestHandlerIm pl.createResponse(AJPv13RequestHandlerImpl.java:33 5)
at com.openexchange.ajp13.najp.AJPv13ConnectionImpl.c reateResponse(AJPv13ConnectionImpl.java:227)
at com.openexchange.ajp13.najp.AJPv13Task.call(AJPv13 Task.java:352)
at java.util.concurrent.FutureTask$Sync.innerRun(Futu reTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.jav a:166)
at com.openexchange.threadpool.internal.CustomThreadP oolExecutor$Worker.runTask(CustomThreadPoolExecuto r.java:750)
at com.openexchange.threadpool.internal.CustomThreadP oolExecutor$Worker.run(CustomThreadPoolExecutor.ja va:776)
at java.lang.Thread.run(Thread.java:636)