Again thank you! The first issue is related to different key binding support due either to OS differences or Tk version differences. I've now wrapped the troublesome code in an eval to trap the error and handle it in a rather friendlier manner.

The ^M issue is a Windows/*nix line end issue I presume and I have used the fix you suggest - the two chomps are gone.

I'm not sure where the tab characters came from, but they have now been removed.

I'll sit on these changes for a day or two in case anything else comes to light. ;)