Hello everybody. hope to find some help here!
I always used PD with no problem on iOS 10.12.6. I haven't used it a lot recently and now I'm trying to launch it again but PD won't start.
I don't even get the bouncing icon in the dock.
I tried to unistall and re-install Pd-0.53-0 (also tried some other previous versions) with no luck.

I also tried Purr Data but as soon as it opens, it freeze at the main initial window and I must force quit.

Has this something to do with the iOS I have installed? or what could be the reason?

@nhouse Some say trash the preferences files.
Also..... https://gist.github.com/thormagnusson/3639af78d0d54e5d879e
But someone might know for sure.

What is the new OSX version?
Is it an update on the same machine?
As Purr Data is also having problems I think maybe the host file but I haven't seen that in a long while.

Could also be a network issue..... see the end of this thread....... https://forum.pdpatchrepo.info/topic/12055/pd-0-49-1-won-t-load-on-mac-os-10-14-4/15
Or Gatekeeper (same thread).
David.

Wow that first procedure you showed worked straight away! thanks a lot!

I actually never updated. With the sentence "I always used PD with no problem on iOS 10.12.6." i didn't mean that i recently updated the OSX.
I wonder how i could have created the issue but I won't find an easy answer i guess!
thanks a lot for the help, really!