Thanks, John. The command we're using is:

"C:\Program Files (x86)\Java\jre1.8.0_241\bin\javaw.exe" -jar "lawlaunch.jar" -quick -2 -launch "prod2\richclient.lawspec"

No error (that I can find) is generated.The Rich Client simply doesn't launch. Nothing happens at all. No user-facing errors, and I see no errors in the Event Viewer.

So, the above command successfully launches Rich Client if -Xmx is at 636 (default) or 1024. But if  -Xmx is at 2048 or 4096, Rich Client does not launch.

I keep being told that -Xmx should be able to be increased to 4096. Since Rich Client has better performance for us with -Xmx at 1024 than it does at 636, we wanted to increase -Xmx higher than 1024, but something is happening to prevent the program from launching with a heap size greater than 1024 and we're trying to figure out exactly what is restricting the higher -Xmx setting.

Thanks.

Have you tried installing the 64-bit version of Rich Client?

Thanks. We have not but Infor has confirmed it's the 32-bit that's restricting. Appreciate your replies!