fundraiser paypal returns on white page unless correct IPN url is set

Hi there,

we use fundraiser in 2 ways - to handle small donations (donations, by widget) and to fund projects (fundraising, by project). We use paypal for small donations. Paypal listening url is set same as requested: (Your IPN listening URL is: http://gaia-energy.org/wdf-payment-return/paypal/), pledges are completed with paypal and IPN notices are enabled inside paypal account settings. What`s missing is a thankyou page, once user is redirected from paypal towards us. I thought, I could set this anywhere - but currently the user comes back to the listening url only - that remains a white page. Pls help me to set this up correctly.

thx Rob