We could help you check and find the reason. Please send a mail to the support account
era-support.voriigkye@recursor.net containing:
- The adventure with the characters and creatures involved (You may need to use the Scribe button on the Adventure options to ensure a complete adventure file is created).
- The files for the characters
- The list of installed add-ons (even better, if possible, a detail of which were installed previously and which you purchased/upgraded when the issue started happening).
About the connection, I am not sure if I understand the case. Once you start the ERA server on a computer, any computer / phone / etc on the same WiFi network should be able to connect, as long as no firewalls are blocking the IP. Please include in your mail to the support account some detail on the configuration of the PC's involved, and we will try to help with that as well.
Thanks for your interest in ERA!