I'm using JomSocial and various extensions but I have no idea what can be wrong. Also, once more I can't find that "skip JFBConnect URLs which you mention. There is no such option in configuration.Are you using any 3rd party SEF extensions? If so, please go into the settings for it and have it 'skip' JFBConnect URLs. That should hopefully fix your issue.
Are you seeing that message anymore? If not, then it's not an SEF problem or any other conflict. That message was why I referenced the SEF extension.Error 500: View not found [name,type,prefix] JFBCONNECT,HTML,JFBCONNECTVIEW
COM_JFBCONNECT_THANKS_FOR_SIGNING_IN
COM_JFBCONNECT_EXISTING_USER_INSTRUCTIONS
; COM_JFBCONNECT_THANKS_FOR_SIGNING_IN="Thanks for signing in using %s. Do you already have an account on this site, or would you like to create one?"
COM_JFBCONNECT_EXISTING_USER_REGISTRATION="Σύνδεση"
; COM_JFBCONNECT_EXISTING_USER_INSTRUCTIONS="If you already have an account, just log in here, and we'll link your %s account to it."
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