The first install has worked for me differently. I have a network with a 192.168.0.x net and the FBE was set originally to 192.168.1.168 . I set my notebook/pc to 192.168.1.200 and then i could access the FBE to change the IP to DHCP (or fixed within the local network) and then set my notebook back to DHCP. I only needed to check my router for the IP that was accessed to the FBE after reboot and then fixed it in the router config.
Nevertheless, the TX muxer problem has nothing to do with the initial install. Maybe other users with the same firmware have the same problem after switching to VLC muxer. My older FBE200-H264 works fine with VLC muxer.