The 3 zip files are the old firmware I couldn't get to compile (so not using at all now) you've already seen the marlin main and config from it, that's why the duff code is still in there.
I started with a brand new version as previously I had just been copying my configuration, pins and thermistor table files over so one or all of those may have been old/corrupt and no longer compatible. I thought if I follow your instruction as though it's a fresh build with fresh copy of marlin we'd at least know the starting point is the same, does that make sense?
Once I get home I will try pronterface first and see what happens, if it works I will try the change and see if that helps Repetier or not. Hopefully it will fix the other problems. If not I will zip my new version that I'm using for you.
Thank you again, seriously you don't know how much I appreciate it.