After some updates and upgrades, old projects, completed before, are OK, but one new, created in the middle of the updates/upgrades process, is not rendered. I believe the problem is in the project itself. Just saving it under a new name doesn't help. I think I need to create a new project. How can I transfer into it as much as possible step by step what has already been done in the old one? Old project is Vegas 18, I want the new to be Vegas 21.