Thanks for the feedback. I meant strange if it was something to do with the Poser installation itself, since 7 and Pro are completely independent. This suggests that there is something in the 7 and Pro code base that does not like the fairly standard Logitech mouse drivers I am using, and if this is the case then I think it is indeed SM's problem. But I'm now wondering if it's something to do with my Wacom tablet.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)