Hi rkmcswain, thanks but that doesn't work for me - i tried selecting one dimension object and pressing 5 - the dimstyle didn't update, nor did the object change to that dimstyle, tried the same with multiple objects selected, same results..
And also noticed that if then press 5 without selecting anything (ie: to just update the current dimstyle), one of the dimension objects does change to the dimstyle (which is due to the 'previous' bit in the dimstyle part of the lisp) but this would change any dim object selected before, if it was only for changing the layer or editing the text..