When I ‘double’ urlencoded or ‘double’ un-urlencoded data, this had no effect – apart from the + sign. As this stands for different things depending on whether the data is encoded or not, this created the problem.

All I have done now is vastly simplify when the question data is encoded – this is now only done when data is saved and loaded or when the data is passed onto the finished Flash file.

I’m still working on it, but it is excellent to have discovered the solution to this rather irksome problem