can't change preferences

[Graham Menhennitt]

Hi GnuCashers,

I'm running GnuCash 2.6.19 on FreeBSD 11-stable. Everything seems to 
work correctly except that I can't change any preferences. I try to 
click on the tick boxes/radio buttons etc. in the Edit Preferences 
dialog, but nothing happens. It's as if everything is read-only.

I presume that the reason for this also causes that it doesn't remember 
my most recent open files, and it always shows tips on startup even 
though I unticked the "show tips" box.

Does anybody have any clues, please?

Thanks,

     Graham