One day after apparently resolve the problem, I'm not so sure right now. I've unmarked again the option "Switch tool based on tablet device" and the problem continues solved so perhaps it was another change I did yesterday. (I did a lot). Anyway, some problem of performance seems to has th...

Same problem here with the pen tool, not with the calligraphic, and with windows 8.1 and a wacom cintiq tablet but SOLVED!!!!!!!!!!!!!!!!! In my case, changing the entry preferences. My copy is in spanish so I fist write the path as it appears in my Inkscape and then try to translate: Preferencias >...