A geocacher asked me yesterday for an other hint but I cannot answer him because the message center on the website or on the Android app does not let me send some of my messages.
I tried today and the problem was the same, so I looked for what kind of message is blocked.
According to my tests, all messages that contain a dot without space before and after are not sent.
- N 49° 25.194 E 000° 13.544
- 1.60 ft