To my sorrow, I updated my arch linux system, a distro that cruelly and relentlessly reminds one of the reason for the old adage, "If it ain't broke, don't fix it!"
So now vim is a little peculiar, announcing every file with E303, could not open a swap file for this file. The help points to a defunct web page for further information, and declares this is a problem with one's X configuration.
I think this unlikely as vim behaves so whether or not X is running, and it is not that I am out of disk space either. Can anyone advise me of other possibilities?