Alex,
I've been doing a deep dive into your plugin code and I noticed that you use two pieces of code that send an item to Apache's error log. These are:
1) error_log('login/register redirect - '.$redirect); (in loginregister.php)
2) error_log('logged into linkedIn, no signoff though.'); (in linkedinprofile.php)
Are you using these merely as flags so you can trace what is happening, or are these real errors?
- JW