Since the before-last release, I have the same problem. The "open in geocaching.com" link is not working, and the box where I could tap to also open the cache's page, a bit above in the app, also doesn't work. I'm not a paying member of Geocaching or this app, however these features worked just fine prior to 2 updates ago - and they still work on my wife's iPhone, who didn't update the app, thankfully.
Your reply was that this would get fixed in the following update, however this was not the case. I hope it does get fixed soon, otherwise the app is almost useless to me. Thanks!