Not sure, but it's possible there was a copy running under the same user. Thanks for that hint. I have just opened a fresh gthumb without problems so that may well have been the trouble. I am running SL 7 and a gthumb from nux. Malcolm MacCallum ________________________________________ From: [log in to unmask] <[log in to unmask]> on behalf of Mark Stodola <[log in to unmask]> Sent: 13 February 2017 22:04 To: [log in to unmask] Subject: Re: gthumb now giving an error On 02/13/2017 03:40 PM, MAH Maccallum wrote: > I have been using gthumb happily for a while. It has > suddenly started to evoke the error message; > > GDBus.Error:org.freedesktop.DBus.Error.NotSupported: Application does not handle command line arguments > > This happens even when no argument is given on the command line. > Does anyone know why this has started to happen? (Since it did not happen > before it cannot be an error in the program itself surely...?) > > Malcolm MacCallum > Do you already have a copy of gthumb running under the same user? I think this was a bug in F20 and fixed in F21 a few years ago. Not sure what versions they are/were compared to whatever SL you are running (you didn't specify which major release you are on).