PayPal Error unable to decrypt certificate id

I followed ALL the steps in the Quick-Start Guide to setup this program.
I then setup 3 Membership Levels. I generated the PayPal Buttons and placed them on the Membership Page. But when I click on the Buttons I get 2 Different Errors, depending on my “Enable Button Encryption” setting. Bottom line, I can’t get the PayPal Buttons to work properly.

1) When I have the option “Enable Button Encryption?” Set to “YES” I get this error message:
Error Detected
We were unable to decrypt the certificate id.

2) When I have the option “Enable Button Encryption?” Set to “NO” I get this error message:
Return to Merchant
Invalid Regular period. You must specify valid values for the A3, P3, and T3 parameters for a subscription.

* I’m assuming this is a Common Problem, with a Common Solution.

Do anyone know the Solution?
Thanks in Advance for any Help.

Hi Cheavor.

It sounds like you may have a parsing problem, some plugins/themes could cause this.

Could you, as a test, change your theme to the default one and see if the buttons works then? If not, start deactivating other plugins one by one and testing after each. You may find the one causing it.

I hope it helps. :)

Is there a solution for this yet ? It seems like everyone’s been having this problem for years. Please someone post a solution, if you know it.
Thanks
Hari