Selecting the "From File" prompt in the Instrument Response field causes FLIMJ and Fiji to freeze. Activity Monitor registers Fiji as "not responding" requiring a force quit.
Barring the FLIMJ plugin and updating the java library to version 1.8.0_265 my Fiji is stock. My MacBook is also running the latest install of MacOS Monterrey 12.1.
If this isn't actually an issue and me being dense then please let me know!
Cheers
Daniel