The donor in ZD #215861 received an error using iDEAL: "the ideal form doesn't seem to be working (instantly redirects back to form instead of going to payment provider)". They're using Firefox 44.0.2 on windows 7 and entered the form at this url: https://payments.wikimedia.org/index.php/Special:GlobalCollectGateway?title=Special%3AGlobalCollectGateway&ffname=rtbt-ideal&language=en&country=NL&frequency=onetime&amountGiven=&uselang=en&bannerhistlog=d45364f1b2d607fb
I am able to locate their attempts at the Ingenico portal, where they received a Status 100 error: NO VALID PROVIDERS FOUND FOR COMBINATION MERCHANTID: 6570, PAYMENTPRODUCT: 809, COUNTRYCODE: NL, CURRENCYCODE: EUR .
@Ppena has suggested this may be caused by the donor using the back button on the browser to change the selected bank. I'm unable to replicate this error (using the donor's url or the back button), so I will follow up with the donor to see if the back button is related. If we see more instances/get more feedback I will update here.