Explicitly blocked support for JetBrains 2021.2 updates - The 2021.2 JetBrains IDE updates appear to have significant issues. I've filed bugs in their issue tracker for the ones I've found, but in the interest of keeping things stable, this build of Illuminated Cloud 2 constrains the maximum allowed base IDE to be 2021.1.*. Once JetBrains releases fixes for these issues and I've confirmed that IC2 works well under 2021.2.*, I'll remove this constraint. If you'd like to follow the status, please keep an eye on Issue 1944.
NOTE: As you have already upgraded to 2021.2, please install the latest 2021.1 build instead from the Other versions link on the JetBrains product download page until these issues are resolved.