Interesting, I didn't realise there was a version where this wasn't happening. I've just installed it, but it's closing the app whenever I try to start a custom remote. I might need to do some digging there. Are you using the latest server and this APK successfully?
I've never used Bluetooth for connection, I don't have a card at the moment. Are there any disadvantages connecting that way?
I have kept quite a few versions of the app and of the server. There used to be a repository of every release and nightly builds here....... http://static.unifiedintents.com/unifiedremote/builds/
but it is gone....... probably still exists somewhere, but maybe now "private".
It was very useful in the case of serious bugs in a release.
I still run quite old versions (app 3.0.23)...... as I have no reason to update if they are working.
Backups of apps can be as important as backups of data........!