EDIT:
I see you're in Austria. Unfortunately tapatalk cant pass the firewall check outside of the US and Canada. You're options are using the mobile version or use a US or Canadian IP address through a VPN.
I will ditto SWOHTR comment, try the mobile version of the site. After our software change in January I moved away from Tapatalk and I'm not looking back. One issue with tapatalk is we are stuck on their development schedule to get things fixed, if there's an issue between the software and tapatalk.