I'm not sure if this is the same issue, but I did find a bug where the links were getting cut off, so that the "Linkout" displayed on the tooltip in the Large calendar would only display part of the url. It's in ec_js.php, around line 400 or so, there is a line that includes
which is retarded. No idea what it's doing there, taking only the first 19 characters of the url. But if you change that to just
the full urls will be displayed.
Edit: by the way, this is in version 18.104.22.168, according to the readme.