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PayPal API - Enable this solution stays greyed out

PayPal API - Enable this solution stays greyed out

I'm quite new to Magento and I'm having a problem enabling PayPal Express Checkout .

 

Under System > Config > Payment Methods I've added the relevant PayPal API credentials and set API authentication method to API Signature but when I save the config the 'Enable this solution' dropdown remains  greyed out.

 

I'm using Magento 1.9.2 with onepage checkout

 

Anybody had the same problem - am I missing something?