The fact that you've essentially re-designed how the platform is run -- both for editing and creating new presentations -- during the middle of a school year is extremely frustrating. The fact that you also didn't put any notice out that this was coming is also an issue -- people log on to create or edit an existing lesson and find out it is all different and that their existing ones can't be edited at all is not good. Most don't have time to fool with learning the new system at this time of the school year. The suggestions to just re-create all of these existing ones using the new method is not really rational, either. I've used your system for years and always talk it up as such a useful tool, but it may be time to find a different platform.