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It has come to my attention, since the last JomSocial update, users are now unable to use the "login button" in the top right. What happens is you can click on the button, the window appears, but no matter what info you enter the window simply disappears without logging you in.
I suspect this is the same issue that is preventing JomSocial from being able to log into my site to work on other issues.
I will greatly appreciate your assistance in resolving this issue.