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What will cause a print_r and / or var_dump error to debug a variable?

I am trying to debug the PayPal review process in Magento. Every time I try to reset the following variable, I get a white page:

//the variable declaration:
$shippingAddress = $this->getShippingAddress();

//the dump that breaks the page:
 <?php echo '<pre>';print_r($shippingAddress);echo '</pre>'; ?>

I also tried using a variable on the page that was used for something other than if statements.

//this variable displays results
<?php echo '<pre>';print_r($billingBlock->setShowAsShippingCheckbox(true)->toHtml());echo '</pre>'; ?>

//however, this one does not:
<?php echo '<pre>';print_r($billingBlock);echo '</pre>'; ?>

I'm just wondering what could cause my var_dump to break the page? How do I see what is in an object if I cannot reset it?

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