This might be due to a transient cookie error or a changed browser setting/version.
The easiest/quickest way is to update to latest Community Builder by going to our Downloads section ("Dowloads" menu on top:
www.joomlapolis.com/downloads
), and download latest Community Builder by clicking its blue "Download" button, and then install it by going to admin Joomla's "Extensions" / "Manage" / "Install" menu, then click the "Upload package file" tab, and select the downloaded file.
Once that is done you will have the newest Community Builder with the much improved Install from Web updater for CB and all add-ons. You will even be able to add a site key in CB configuration, so that you don't need to be logged-in anymore. Read Kyle's blog for mor details:
www.joomlapolis.com/blog/kyle/18884-updating-and-installing-plugins-the-easy-way
Please confirm that it worked for you now.
beat
