Hi irishguy28, and thanks for the info.

I tried various destinations and some work, but most don't. For example, try ZWE to anywhere in South America. I get the error!

I think the problem comes down to the fact that there is no availability on the dates I'm choosing and instead of saying "there's no flights" it's giving the technical error instead. Those dates INCLUDE the ones in the current offer.

I work in IT, so anything tech related is all under control. Tried multiple computers, browsers, etc.