It is probably the app, I have no control over the forum runner app, it would be best to send them a report bug email.
We are looking at other options for apps on the site. The problem with running an external app like forum runner, is that we are reliant on the provider of the app to fix issues.
WE have our own app, that is run on our network so when things like this happen we have direct access to fixing it.
I have a tech looking to see what he can do with the forum runner app, but it will probably result in us asking them to fix it.
The only other thing I can recommend is for you to uninstall and reinstall the app.