Sorry, I thought you belong Groundspeak organization.
I also have a similar geochecker in my old mystery caches and it is working well in those caches. This new one is the problem. I have discussed with the Finnish Geocache.fi / Kivenalla.fi people, who are owner of this geochecker application and their opinion is that the problem is due to changes Geocaching.com applications. There have been a few similar problem also earlier, but not every new caches.
One possibility that has been mentioned, is that some servers that Groundspeak are using do not works as they should. My competence doesn't be such level that I could say, if this is possible or not. You surely understand these things better.
I also understood that Finnish people have not got any information, what have been changed in Geocaching.com application and this make then difficult the react those chances. Is this discussion/ info sharing better somewhere else?