I'm sorry to hear this. Are you still having this issue with your launcher? If so, please can you press CTRL+SHIFT+i while in the loading screen and navigate to the Console page and then right click a log-line and press 'Save as...'. Afterwards, please can you paste the content of that file onto
and send us a link after saving so that we can view the log for you.
During the loading screen, the launcher downloads all of the files necessary to view the different modpacks that we have available which depending on your internet speed can take a moment. However this will only happen once and then the next startup will be much quicker (until we update the modpack listings again, where it will need to redownload it).
As you're in our Discord server, please don't hesitate to shoot us a message there so that we can work with you quicker, but the forum is also more than fine. Please keep us updated with how you get on.