the blizz launcher has been atrocious since around reforged release. it frequently doesn’t load, or it will load with no graphic. when loaded with no graphic, the border of the window will appear, but it will be entirely empty/ transparent to the rest of the desktop.
closing and restarting often is to no avail, only sometimes a hard reboot might work, but sometimes not. it’s quite a grueling process to even get the launcher to load up.