@Nicolas-Danet thanks! So many things I learnt in the last few hours... didn't even come to think something like configuring a network could affect pd loading or not

@Nicolas-Danet @whale-av

thank you SO much for the help!
I just managed to fix it!

Yesterday morning I needed to make a wifi network... (just to connect devices together, without any actual internet) and I couldn't find out how to do a network with a password so I followed this thread for advice:
https://apple.stackexchange.com/questions/182760/how-to-create-a-password-protected-ad-hoc-network-on-yosemite

it was the commands I entered to create this network what apparently led to trouble

sudo networksetup -createnetworkservice Loopback lo0
sudo networksetup -setmanual Loopback 172.20.42.42 255.255.255.255``````

deleting the network from my system preferences / network and restarting the computer fixed the issue.

@whale-av after some search... is it possible that wish was present in earlier versions of mac osx and not anymore with the current os?
I tried to make an empty folder named org.puredata.savedState inside my user/library/Saved Application State folder.. but still not able to enter those commands successfully

@whale-av thanks for your reply!
I tried to follow the instructions on the link that you mentioned but it turns out I don't have any file (or folder) called org.puredata (or pd, or something like that) on my /user/library/Saved Application State folder... so when I type those commands in the terminal it says that there is no such file or directory.

Regarding wish.app... I never had it installed (to my knowledge at least)

this is getting interesting! I get this message.

ERROR: failed to allocate port, exiting!```

I get exactly the same as you... so it must be something else

Thanks again!
It might be something regarding the hosts... I was trying to install a hack to remote control my Organelle via OSCproxy (and didn't get it to work before I got to this issue).

On your first link:
*If Pure Data is not launching on your computer, then check if your /private/etc/hosts file is configured correctly. *

Do you know in which folder I can find this?

Thanks!
Found them and deleted them... still to no avail.
Every time I try to open PD I see its icon appear briefly at the right side of the dock, ca 1 second, and then disappears for good.

Looking also for something going on on the activity monitor, but no processes appear either...

I don't know what to do!

Thanks so much for the help!

How can I delete the preferences? I can't remember where the preference file is.
It's the 64 bit version.
And I approved it manually at startup (right click, open in order to authorise it)

thanks for the reply!
if I type .app then I don't get any error messages, but nothing happens (pd still doesn't load)