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I have users registered in groups "webmarketers" and "regsitered"
When on of this user login from front page it is fine.
then user navigate. wait......
When he comes back and refresh page, joomla ask him to login as he's disconnected.
So he fill the login form in top of socialize template, and get this errror message:
I created new test user with groups "webmarketers" and "regsitered". not sure why I can replicate this issue.
regarding the error message, 403 mean forbidden access. seem there is firewall/security extensions that running at your joomla installation.
please turn off it first. maybe Securitycheck plugin or else.