Roundcube not installed and Horde not loading

[Ninetienne]

In the list of available webmail clients there's only Horde. Why don't I have Roundcube? I thought it's preinstalled with Plesk 11.5 and higher.

When accessing Horde webmail, the page never loads till the end and all I get is the top menu, no e-mails.

Please advise.

 

[abdi]

Do you have anything in logs that can give clue?

http://talk.plesk.com/threads/roundcube-error-404-not-found.303721/
http://kb.odin.com/en/116849