Yes, the File Transfer will be revamped so that directories open faster. This is on our to do list for the nearest updates.
Regarding the online status - it's the first implementation of this feature in Remote Utilities so there is a chance that some issues may appear that we don't know about. So any feedback would be helpful.
When I try to connect to a PC that is about 100 km away, not that the distance really matters ;), I cant connect to the host (version 6.3).
You need to upgrade the Host to version 6.5 too. Always try to make sure that the Viewer and Host are the same version. There is backward compatibility , in theory, but you still should avoid relying on it all the time. It's better to upgrade.