New demo game; Scripting updates; Bug fixes.
Maybe we are having this issue too - it's not just you, we have just haven't got around to reporting it, because we haven't been able to reproduce it in an example project.
For us, the first time the project is previewed after opening, models look messed up, with meshes in the wrong order, hidden or with missing textures. Like you say, it can actually be resolved by changing any property that affects the renderer back and forth. This has to be done every time the project is opened. We've started flipping the layout 3D mode between orthographic and perspective which fixes it because this is quick and easy. Strangely if you export the project while in the broken state (before flipping the setting to fix the renderer) it has the broken models issue even in exported games. Any ideas on how we can reproduce to report?