The font size change is caused by Inkscape putting px after the font size number such as 80px if your remove the px leaving only the number the problem goes away. I have to do that in an external text editor which is a pain and a pain to remember to do but it does work. It is also a hidden time bomb, in that many times the first part edit works fine lulling you into thinking its fine, and it changes the font size to 0 on the second edit ... Changing the order of my text changes to the start and then making copper layer changes after seems to work for me so text is just somewhat sensitive with Inkscape not entirely impossible as I was beginning to think 
. Indeed being able to move the rectangle on the copper in to copper0 also works fine so thank you again.
Peter Van Epp