Yes it is annoying that it was correct and then became incorrect with a subsequent update.  I'm just concerned that if it can happen with this, it can happen with something else.  That is why I would like to see a mechanism to lock the tax file after efiling similar to closing the books so that changes cannot be made to the file inadvertently.  The software that I use to file 5500s has such a mechanism and it would be nice if Proseries could also incorporate this.  I know that there is the "display changes" feature when a change is made to the original file, but that is only if the change affects the tax return itself.  It doesn't seem to be triggered if there is a change to the estimated tax vouchers.  I thought that it might be helpful to alert others to this specific issue.