I haven't tried to adjust it lately but I've tried different settings about 10 times. It is like third gear suddenly needs a shorter cable length. I guess I will try adjusting it again and again and again and again...
Sesame, is the adjustment the ones given on the SA site? I've also just put it in 4th gear (if I recall) to line up the marks and when that didn't work, tried a hair more and then a little more and when it got worse, I tried the other direction. The best I've been able to do is just 3rd gear doesn't work.