Hi,
I acknowledge there are some issues with the current packaged release under medium trust. I was able to help someone else by packaging up the latest code for them. Which db are you using? I'm not really ready to make the next official release but if you like I can package up a preview release of the current code that should solve the openid medium trust issue.
The first error looks like a null reference about a resource file. My guess is either you have configured the default culture to something other than english and the resource file for the chosen language is missing some keys or else maybe all the resource files did not get uploaded to your site under the App_GlobalResources folder. If you set the default culture to something other than english, you must make sure you have a complete translation of all the keys.
Best,
Joe