Try connecting them to a windows pc running DMX workshop (download from AL) and reset them.

Check that they haven't been set to a 10.x.x.x address range - this can be done by dmx workshop or by a jumper inside.

It is also possible that a custom IP address may have been set by DMX workshop - which may conflict with an existing IP address on your current show network.
DMX workshop settings can also overide the font panel selector wheels

A reset in DMX workshop (and firmware update) will probably sort it out...

Simon