These are just some generic trouble-shooting ideas:
Version '4.3-2715' is only about 4 weeks old, so it seems that you have a fairly recent version.
Did you upgrade in place, or did you reinstall from scratch?
When you say 'no longer appearing', what do you mean?
1) Do you have the services successfully tuned, but you no longer have a picture?
2) Are you trying to tune to that frequency and you are not seeing any services?
If you started from scratch, which 'scan file' (Country/Location) did you select when you set up your system (France-All, France-Paris or something else)?
Do you know if your local "514 MHz" (UHF Channel 26) mux is transmitting DVB-T or DVB-T2?
Do services from other muxes work on your system?
