I am trying to create haplotype networks in PopART which I have successfully done many times in the past. 2 weeks ago the program was working fine for me but recently I am unable to load files. What happens is that when I go to load a nexus file through the "nex" button, or through the "file/import/alignment" or "file/open" options nothing loads. There is no error message, instead nothing happens. This occurs with both files I have recently created and with files that I have successfully loaded in the past. I've sent files to other people and everyone has been able to load the files using PopART on their computers. I am running macOS 10.15.6 and have tried turning my computer off and on as well as uninstalling and reinstalling PopART. I also thought that maybe Java wasn't up to date on my computer but I don't think PopArt runs with Java. Any help would be very appreciated!