Trouble with buyers not getting financing?

I'm wondering if there are other flippers out there that are having trouble with their end buyers not being able to get financing due to the banks tightening of credit. I have two rehabbed properties for sale and I'm getting plenty of offers but everyone of them has ended with the financing falling through. My realtor has pre-screened these folks but with the credit criteria changing daily, what's a mother to do?!

I'd like to hear your stories.