Dear,
Thank you for using Braph. I hope it will prove to be a useful tool and very helpful for your research.
I checked the issue you were having and it originated from a small mistake into the AAL90.xlsx file. Therefore, the problem was due to the particular file and not in Braph.
If you would like to use the same AAL90 brain atlas, you could import it from the corresponding AAL90.txt file (I checked it and this works fine).
We will try to correct the mistake in the AAL90.xlsx and upload it on the website.
Hopefully, this solve your problem. However, if you need any further assistance, please do not hesitate to contact me.
Best,
Mite