Fatal issues with Minecraft on the new launcher.

I just downloaded the new minecraft launcher, and I am having big issues with it. Everytime I close the launcher, I get logged out, my profiles don't save and my worlds don't save. (and it suddenly deleted all of my worlds). Please fix this as its an extremely big issue. I tried many fixes such as reinstalling the launcher, deleting the .minecraft folder and etc but it didn't do any difference.

(sorry for the lag in the video but my pc is not the best)