If you clear the winfile cache and do this on a new blank php page do you still get the error?
I'll have to debug this with you directly. I can't imagine what the cause might be since I haven't seen it before. If it only happens on this particular page then maybe you can send me the page so I can reproduce it and debug it independently, otherwise I'll need a US phone number or Skype contact information to set up a screen sharing session to look into it.