I just upgraded to IntelliJ IDEA 12.0 and get an error immediately upon attempting

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Asked: June 15, 20262026-06-15T21:22:30+00:00 2026-06-15T21:22:30+00:00

I just upgraded to IntelliJ IDEA 12.0 and get an error immediately upon attempting

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I just upgraded to IntelliJ IDEA 12.0 and get an error immediately upon attempting to launch:

The JVM could not be started.  The maximum heap size (-Xmx) might be too large or 
an antivirus or firewall tool could block the execution.

I checked my idea.exe.vmoptions file and the maximum heap size is only 640m (I have 8 GB physical memory and am not running any other applications).

idea.exe.vmoptions

-Xms128m
-Xmx640m
-XX:MaxPermSize=640m
-XX:ReservedCodeCacheSize=64m
-XX:+UseCodeCacheFlushing
-ea
-Dsun.io.useCanonCaches=false

I still have IntelliJ IDEA 11.4 on my machine and I am able to run that (using the same values for max heapsize in idea.exe.vmoptions). Since IntelliJ IDEA 11.4 runs, I don’t believe it is an antivirus or firewall issue. I have also checked those settings as well.

Anyone run across this or have any idea (no pun intended)?