Used CYC plenty of times mate, great company to use. E-mail Tim at CYC if you've got a problem will sort you out no worries. I've lost lots of cash their way, its to addictive.
 
i found it an issue only when using firefox 4 64bit nightly builds and no script add-on - even though this was disabled.
when done via ie no issues.
same as others i dropped Tim an e-mail and he confirmed only charged once.