I tried to summon "help" for Gnucash but the KDE Help Centre pops up
with the message "no documentation found." The documentation is
installed, as is Yelp. The same problem occurs in 12.2. Any ideas I can
try?

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Graham P Davis, Bracknell, Berks.
openSUSE 12.3-B1 (64-bit); KDE 4.9.98; AMD Phenom II X2 550 Processor;
Video: nVidia GeForce 210 (using nouveau driver);
Sound: ATI SBx00 Azalia (Intel HDA); Wireless: BCM4306