Ok the answers to 1 and 3.
1. On the jogging tab you will see a button that says "Keyboard Inputs Enable" this needs to be green which will remove the red cross from the icon in the taskbar.
3. Open up mach4mill using the wx4 screenset, then Operator->Edit Screen look under main tabs in the tree and highlight tabDiag and right click on it, you should find an export. export this then load your profile and do exactly the same but this time import it and you should then have Diagnostic tab.
DazTheGas