The progress bar going backwards is not a big deal. The amount of work doesn't change it's just the way it got represented is going to change. It was or waiting for the % to slowly increase or for it to be set back and see the % increase faster.
Guys, that doesn't add up.It's not like it hasn't happened at least twice before (see #15 in my FAQ above). Also, it really isn't unusual in projects for that to happen - even actually having to go back and redo work already marked as complete. Thirdly, as Chaos_Alfa states - progress, in this case, isn't actually going backwards... it just will look like it, based upon the percentage because they are going to try to better define how much each of the remaining tasks contribute to completing the tech update - rather than all tasks having the same percentage, no matter what amount of work is involved.
Regardless of how you break up tasks, if you have 84% of the game completed, then 84% is completed. However you choose to break the remaining 16% of tasks has no bearing on already completed ones.
As an example, if you have 16 tasks for the remaining 16%, then each task will advance progress by 1%. If you change it so that the progress bar is more representative of what is actually going on, say, by having 64 detailed tasks instead, then each tasks will advance progress by 0.25%.
Unless I'm missing something. It's possible. Could you explain in that case?