Having the same problem for 2 or 3 weeks now, windows 7 64 bit, intel i7 3770k, 16gb ram. The error id the guardian gives is all zeros. I've tried reinstalling. I've uninstalled, restarted, then reinstalled. No idea what to do about this other than to petition the company I work for to use a solution for meetings that works for everyone. Been using joinme for over a year without problems prior to this.
I have read each post but hardly anyone gives their operating system, anti-virus, or any particulars of their computers. If you are still having these issues I would suggest adding an exclusion to your firewall and checking your exclusions in your anti-virus. For example Avast in hardened mode may silently block complete access so you would enter *\LogMeIn as the path in File System Shield, this would also apply to windows firewall.
