It get even trickier... I just double-checked my local install, and I didn't have visualization_plugins_directory uncommented, and yet, it works on local install....

>This gets tricky, can you check if the visualisations are loacted under
>this path

If you mean phyoviz and other plugin code from github, then yes, it's there. I doulbe-checked the files and permissions as well, just to be sure.

> and do double-check the filetypes? The icon is only displayed
> with the correct datatype.

I did... I use exactly the same newick tree file for local and for production test. Upload it, selecting nhx as a datatype. Double-check the datatype by clicking on a pencil icon - it's nhx on both, but it works on local and doesn't on production.

I'll keep digging and comparing the two installs. If you think of anything else, let me know.

Thanks!

Oksana