[ferret_users]: pyferret cannot find engine PipedViewerPQ

[Martin Schmidt <martin.schmidt@xxxxxxxxxxxxxxxxx>]

Hi,
I stumble into a strange problem with pyferret. The same code (really 
identical code - installed on a central software file system)
works on one machine, on the other it does not. The error message is
<phy-1:mschmidt>ferret
        NOAA/PMEL TMAP
        PyFERRET v7 (opt)
        Linux 3.19.0-64-generic - 07/01/16
        16-Sep-16 12:44

yes? use coads_climatology
yes? shade/l=1 sst
Unknown engine: PipedViewerPQ
STOP FGD_GACWK: null windowobj

A blank window opens and ferret crashs.

The operating system on both the machines is suse linux OS13.2. python 
is python2.7, installed from the
linux distribution. ferret is installed from 
PyFerret-7.0.0-Ubuntu-14.04-64.tar.gz, but a binary build by myself 
shows the same
error, again it works only on one machine.

The traditional ferret v7 is running well. Also the example described on 
the ferret web-pages to start python first, than import pyferret and 
execute ferret from there, still works well.

PyFERRET v7 was running well on both the machines some weeks ago. I 
think, but I cannot be sure, that the error showed up after the
last system security update, including curl, wget ... I do not remeber 
in all components. The update is applied on both the machines.

The difference between the machines is:
- pyferret is working well on a PC-like machine with a kde4-desktop.
- pyferret is not working any more on a remote server, where I am logged 
in via ssh -X

Any idea or suggestion on the possible reason and how to fix this, would 
be very welcome.

Greetings,
Martin Schmidt