Europa Universalis IV hanging forever on launch

Attempting to launch EUIV the first time opens the Paradox Launcher and lets me sign in. Trying to launch from there, however, causes the EUIV logo to briefly flash before going black and crashing. Subsequent launches result in an error box saying "Looks like the launcher is not responding. Do you want to close it?" appearing indefinitely. The same thing happens on Proton-GE and Wine-GE.