Tapatalk not working

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http://forum.xda-developers.com – I have installed Tapatalk on my new Nexus 4, but whet it starts it says "Directory is currently unavailable, please check again later". It's been like this for two days. When I try to login, it just waits forever. I search the internet and the only explanation I found was that this error message can appear on some 3G networks. However, I'm using my home WiFi and on my tablet (Transformer Prime) Tapatalk connects to its directory with no problems. Any ideas? (HowTos)