Can't export calendar or tasks

[bristr]

Hello,
I am running Open-Xchange 7.4.1 Rev7 on an Ubuntu 12.04 LTS server.
Whenever I try to export contacts, it downloads the CSV file just fine. However, exporting my appointments and tasks (from the screenshot: export.png) does nothing at all. Importing works flawlessly. Is there an additional package I'm missing to make exporting work properly?

Thanks in advance.

[bristr]

This got fixed with the latest update.