I am getting [now every time] a message "Run time error 76 FSUIPC.RCV4CODE", and of course Radar contact stops. What is this please?

Here is a reply from JD in another topic hope this helpsdid you specify the .flt/.wx path, by clicking the .flt/.wx button?are you running autosave? you probably are, and when that kicks in to do a save of a .flt and .wx file, rc tries to write it's .rcd file to a path you specify.jd

Yes "was running autosave", but not now as have deleted dll file. All is well now, . Just might re-install later....thanks. AB68

autosave saves a .flt/.wx file. when rc sees fs saving files, rc needs to save a .rcd filei have to know where to save it. that is why the .flt/.wx button is used to specify the path to save itjd