Occasionally I need to uninstall and reinstall tapatalk and that does the trick.
I think there is an easier way. If you go into Settings, scroll to the bottom to Advanced>Reset...and then Clear Cache it should fix the issue. I had uninstalled and reinstalled Tapatalk a few times on my iPhone 4 before finding this. It worked last time I got the message that the server couldn't be reached or whatever it says.
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