Using the latest dev version of Commerce Paypal, enabling both the Views and Commerce Paypal WPS modules causes an error every time the caches are flushed.
I've confirmed this error happens on a blank installation od Drupal 7.14, with only the required modules for Views/Commerce Paypal WPS enabled.
The error (without the mile long backtrace) looks like this:
PHP Fatal error: Maximum function nesting level of '100' reached, aborting!
I've narrowed down the problem to a call in
commerce_paypal_wps_commerce_payment_method_info() (line 15 of commerce_paypal_wps.module):
$icons = commerce_paypal_icons();
Removing this line fixes the error (but obviously throws up a couple of warnings about uninitialised vars on the next two lines).
Is anyone else having this problem?