Despite rigourous testing by a hugely dedicated team (me) it appears that the new version of FotoSketcher (1.5) may actually cause problems to some users...
In fact, if you have no printer installed on your system (or if the print spooler is not started) then you will get a 1722 error code (and you will need to frantically press ctrl-alt-del to stop the FotoSketcher process).
Thanks to Dod for pointing out the problem (and finding the cause!).
I will address this problem ASAP.