There is a bug in Inkscape 0.91 when in KDE are used GTK programs using
oxygen-gtk.
The bug prevents to create guides in Inkscape by dragging them from the rulers
in to drawing area. But there is a work around helping to create such guides.
Even if users create such guides they can not manipulate them - move or delete
them.

Here is a lengthy discussion about this bug and there is stated how to solve
it:
https://bugs.launchpad.net/inkscape/+bug/1109812

The solution they found, is described as follows:
"
Maggio (dev-maggio) wrote on 2014-06-16:     #13

Hello,

I confirm this bug.

We can fix this bug by replacing "TRUE" by "FALSE" at :
http://bazaar.launchpad.net/~inkscape.dev/inkscape/RELEASE_0_48_BRANCH/view/head:/src/desktop-events.cpp#L273

PS: "TRUE to stop other handlers from being invoked for the event. FALSE to
propagate the event further."

"
Yes I know that using different gtk theme may prevent this behaviour. But
oxigen is the default setting in many cases. Also there are many users who
could not realize this and are not happy with the Inkscape 0.91 in openSUSE.

So my kind suggestion is - possibly to ask some SUSE software engineer, to
found the right place in the source code used by SUSE for Inkscape, and
possibly to change this "TRUE" by "FALSE". This can make the use of Inkscape by
the regular users of openSUSE much more fun.