[SOLVED] Issues With Cb login module

Recently, I noticed that my users are having difficulty registering on my site as I confirmed that by registering a new account by myself.

When they click the register button after filling in their details, they get a blank page. When they refresh the page, they now see the instructions on my site that says they have to check their email for a confirmation link.

They are sent the confirmation link but once they click on the link they get this message, 'You are not authorized to view this page!
You need to log in.'

When they try logging in, they get a blank page again and nothing happens.

Please how do I resolve this asap as I have obviously lost a lot of customers to this issue? I'm using the latest CB 1.8 Stable.

Please enable debug mode and maximum error reporting within Joomla global configuration. Once done test registration and review any on-screen errors. You've likely a 3rd party CB plugin, Joomla system plugin, or Joomla user plugin causing a fatal SQL/PHP error.

It looks like it's even gotten worse. I did all you suggested and then I tried registering again.
First of all, here's the error I got after hitting the register button

"Warning: require_once(/home2/smssenda/public_html/sms/plugins/content/../../components/com_virtuemart/virtuemart_parser.php) [function.require-once]: failed to open stream: No such file or directory in /home2/smssenda/public_html/sms/plugins/content/vmproductsnapshots.php on line 42

Fatal error: require_once() [function.require]: Failed opening required '/home2/smssenda/public_html/sms/plugins/content/../../components/com_virtuemart/virtuemart_parser.php' (include_path='.:/usr/lib64/php:/usr/lib/php:/usr/share/pear') in /home2/smssenda/public_html/sms/plugins/content/vmproductsnapshots.php on line 42"

When I now refreshed the page, I now got this message

"You are already registered with this username and password.
Registration Complete!
Your registration requires email confirmation and approval. Please follow the confirmation steps sent to you in email. Once approved you will be sent an acceptance notice to the e-mail address you entered.

When you receive approval then you will be able to log in."

Please what could likely be the issue here as I just confused?

The 3rd party Joomla content plugin vmproductsnapshots is throwing the errors. Disable it within Joomla plugin manager then retest registration.

Thanks Krileon for your response. I just did that and also the uddeIM PMS Content Link, my site is back in shape.

Thanks for your time.