Dear Macports users,

I have a MacBook Pro with MacOS 10.13.6 on which I installed several programs 
through Macports. However, when I installed the grace package in order to use 
plotting program xmgrace, the following message error pops up:

Warning: Widget must be a VendorShell.
Error: attempt to add non-widget child "dsm" to parent "xmgrace" which supports 
only widgets

Notice that I have successfully installed the grace port on other older and 
newer machines without any problem.
Googling the error, I found several old posts, which provided various possible 
solutions, including installing a version of XQuartz older then 2.7.9, but none 
of them worked for me.

Therefore, I decided to remove completely Macports (and its ports) from this 
laptop by the procedure found here:

https://guide.macports.org/chunked/installing.macports.uninstalling.html

together with XQuartz. Then, after a reboot, I reinstalled Macports, XQuartz 
and just the grace package. In spite this reinstallation I keep having the same 
message error.
Finally, I tried to create another account on the same laptop, installing 
Macports, the last available version of XQuartz (2.7.11) and the grace port in 
there, and this time the xmgrace programs opens like a charm.

I therefore guess that the problem in the original account is caused by some 
user configuration, which is not removed while uninstalling Macports and 
XQuartz. As last attempt I tried to remove also the hidden account folder 
~/Library, and reinstall again Macports and XQuartz but also this time the 
xmgrace command outputs the usual error message.

Do you have any suggestion what I could try in order to identify the 
configuration file that triggers the above error? Since the original account 
has a lot of important data, I cannot simply remove it and create a new account 
in order to use xmgrace. I would really like to find the source of the error.

All the best,
Emy



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