I clicked [Update and Restart] and nothing came up again. Starting from the command line does not show much.
[oppa@oppa-labor bin]$ ./idea.sh
OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
IDE is being shut down
[oppa@oppa-labor bin]$ inxi -S
System: Host: oppa-labor Kernel: 5.7.11-100.fc31.x86_64 x86_64 bits: 64 Desktop: Gnome 3.34.5
Distro: Fedora release 31 (Thirty One)
[oppa@oppa-labor bin]$ java --version
openjdk 11.0.8 2020-07-14
OpenJDK Runtime Environment 18.9 (build 11.0.8+10)
OpenJDK 64-Bit Server VM 18.9 (build 11.0.8+10, mixed mode, sharing)
Is there a (human readable) logfile somewhere?