Hello, As I said in former message, I reinstalled the whole fedora, and yes ! the wireless is still working :-)
Now that I am sure I have a 'virginal' fedora, I tried to launch sane and Xsane as root and as normal user : 'no device available'. The export SANE_DEBUG_EPSON = 128 ... returned again an empty log file. My feeling is there is somewhere something that is not linked, but can't find out what. Any idea next ? Thank you, PF