Asset Thumbnail disappears and breaks asset

Hey, I’ve been trouble shooting UE5 for a month now… Starting to think UE is the shovel salesman and there’s no gold…
I am developing for VR.

My problem is I am duplicating the grabbable cube, replacing the mesh with my own, applying the gold metal material. I get a thumbnail preview in the content drawer but when I load the game, Only the reflective side shows gold, the rest of the sides are black! When I reload my project, the thumbnail is gone like UE broke it, my asset I can only assume crashes my game over and over and over and over I’ve spent weeks crashing this program over and over and over… WTF. Every 20 times, my game will load once and the problem asset will just be ignored and not display… I’m so tired of this, if you are reading this its too late, you are screwed too I’m guessing. I’m thinking I should have just coded my own game from scratch at this point, I’m about a month in, 14 hour days… Is this really viable for business? I’m so frustrated, I literally YOLO and this program has entangled me more than any other computer program in my life, WHAT ARE THESE DEVS THINKING… Clue me in?

On a side note, every time I save my project there is about a 50/50 chance that it hangs and corrupts WHATEVER I was working on. I cant believe this, no wonder the program is free, what a joke!!! I’ve never used Ctrl+Alt+Delete this muc in my life?!?!?! UE5 owes me EMOTIONAL DAMAGE compensation