Its never been a problem until this project. Her tension and mine have always been the same (and we have the same attitude towards making tension squares/gauge swatches - call them what you will, then wash your mouth out). But this time, oh this time... Can you see the problem?
Yes, you can clearly see that I was knitting at a looser tension once I took over. But, then things got stranger. When I joined in a new ball, this happened
I reverted to the original tension. How? I'm not quite sure what happened, but I wasn't about to frog all that work. It will all come out in the blocking - but that's another story.