yup, my bad. actually, I did update most plugins and unloaded a whole bunch I never used... but it is odd that friday, before M, I was doing fine, hého, mine is not to reason why !
BTW 2013 is otherwise a great improvement & Layout has become usable without driving me back to smoking ! (the previous versions were so slow that I nearly started nicotine again & went back to bricscad instead) & no, I still have the same machine as before, so i imagine that on a super-duper machine with a vavavoom graphics card it would be even better.
thanks