This is on a Windows 10 computer and has been happening since upgrading from 12.0 to 12.1 There is an exception message at startup and viewing the log shows this:
2022-01-20 14:16:48.965 SEVERE 875 [AWT-EventQueue-0 - LoggingFacadeImpl.logSevere] null
java.lang.UnsatisfiedLinkError: C:\Users\..\AppData\Local\Temp\flatlaf.temp\flatlaf-windows-x86_64-1594248040370010.dll: The specified procedure could not be found
at java.base/java.lang.ClassLoader$NativeLibrary.load0(Native Method)
The application appears to work fine after closing the log and continuing but it is annoying. I have upgraded applied a couple of updates hoping that the issue will have been resolved. Currently using 12.1.6
We need a bit more information to understand this kind of issue; I have sent you an email with a request for a debug log.
regards / Peer