After last update to Lighroom 3.4
Yes after last update,
Lightroom CC classic 7.4 stop to work properly, for me the main things are:
the Crop tool and the Straight tool doesn't work properly
the Synchronize doesn't work and is impossible synchronize multiple files
I don't know how is possible destroyed a program that worked before the
update, I think is time of fire someone there!
I hope they fix soon is possible