I am trying to create haplotype networks in [PopART](http://popart.otago.ac.nz/index.shtml) (Population genetics with Reticulated Trees\*) which I have successfully done many times in the past.

Two 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!

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PopArt builds reticulated HAplotype networks such shown below

[![enter image description here](https://i.stack.imgur.com/zrUwM.png)](https://i.stack.imgur.com/zrUwM.png)