[FONT=Courier New]I am brand new to Zen Cart & I am having a similar problem.

When I click on express check-out on my site it goes to a new page that says:
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Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /home/manderhe/public_html/includes/modules/payment/paypalwpp.php on line 1467

Warning: array_merge() [function.array-merge]: Argument #2 is not an array in /home/manderhe/public_html/includes/modules/payment/paypalwpp.php on line 1467

Warning: Cannot modify header information - headers already sent by (output started at /home/manderhe/public_html/includes/modules/payment/paypalwpp.php:1467) in /home/manderhe/public_html/includes/functions/functions_general.php on line 44

[FONT=Courier New] Do I need to get new API credentials from my Sandbox acct as well? If so, How do I do this?

Thanks so much!!![/FONT]