Comment 11 for bug 1164150

Here is the text from the wiki page (http://wiki.inkscape.org/wiki/index.php/LivePathEffects) that might be the same issue:

"""
Spinbutton of effect parameters can get stuck: it keeps on increasing and increasing and is impossible to stop!

* I had the same thing with opacity. It's a GTK bug. The workaround is to disable display interruptibility while you are updating document from the spinbutton's change. See how I did it here: http://inkscape.svn.sourceforge.net/viewvc/inkscape/inkscape/trunk/src/ui/widget/selected-style.cpp?r1=13149&r2=13257&sortby=date --bbyak

* I added the dis-interrupt functions. Now, it only gets stuck when the dialog is not selected before pressing the spinbutton. If the item is selected, then right after the spinbutton is pressed, it gets stuck again. However now, it can be stopped by clicking the spinbutton again... --johan

"""