I have the same problem. Additionaly the plugin "microscope meassuremnt tools" is not working, when i Try to use it, I get the following message in the console:
File "", line 19
from ij import IJ, ImagePlus, WindowManager
SyntaxError: mismatched input 'from' expecting EOF
I iinstalled Fiji new on another drive and still I have the same problems. Could this be related to a windows update?