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Hi there!
I'm using Jomsocial on 2 websites. In both websites the same error occurs, no matter what browser or template you use (even tried it with jomsocial socialize template - which doesn't work at all... but that's another story).
Both sites are Joomla 2.5.17, use a template by joomlashine, newest jomsocial installation
When you want to create an event and click on the "create event" button after filling out the form nothing happens.