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@wolfied deactivate the Ajax Search Pro plugin and check if you can create new topic and reply. jQuery 1.7.1 was not coming from theme but from that plugin, sorry missed that in initial scan.

@wolfied You need to update your theme. I just noticed you’re still using jQuery 1.7.1 in source view while the theme’s demo rightly shows jQuery 1.10.2

@wolfied Could be theme or plugin conflict. Change to Twenty Twelve theme and check.