Am Freitag, 25. August 2017 um 19:48:06, schrieb Scott Kostyshak 
<skost...@lyx.org>
> On Fri, Aug 25, 2017 at 07:44:09PM -0400, Paul A. Rubin wrote:
> > On 08/25/2017 07:29 PM, Scott Kostyshak wrote:
> > > On Fri, Aug 25, 2017 at 02:12:47PM -0400, Paul A. Rubin wrote:
> > > 
> > > > Note that, with either approach, if you reinstall qpdfview, the next 
> > > > time
> > > > you run reconfigure it's liable to break again.
> > > If you set the viewer in preferences, then I don't think it should
> > > change after running reconfigure.
> > > 
> > > Scott
> > You're probably right about that, give or take installing a new version of
> > LyX. When I upgraded LyX to 2.2.3, I think it thunked my viewer preferences,
> > but that was probably a one-off (the business with Mint changing the default
> > text editor, PDF viewer, image viewer and something else I've forgotten
> > now).
> 
> Ah yes that could happen. If you can ever reproduce an issue where a
> newer version of LyX thunks something, then we would like to fix that.
> I remember seeing a couple of reports about that on Ubuntu. But it is
> hard to remember to back up your user directory before an upgrade, so
> it's hard to reproduce.
> 
> Scott

It can happen if using versioned userdir. (e.g. transition from ~/.lyx2.2 to 
~/.lyx2.3).
In that case you may want to copy ~/.lyx2.2/preferences.

        Kornel

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