"Edit the #N canvas line to #N canvas 0 0 xsize ysize" => It works!!
Subpatch reappeared. I wonder why it moved, but we got the result...
Grazie mille!

Thanks for your answer.
"Does the sub-patch appear blank in Windows' task-bar?" => YES
"Did you change OS / hardware / displays or screen resolution?" => NO
Other subpatches in the same main work fine.
Only differences I found is that, in working subpatches Properties, I have:
Dimensions XY = 0, 0
In the not working one instead:
Dimensions XY = 85, 60
I haven't set these values (I believe...), and by BTW they are not changable in Properties box. I do not know where to write the info suggested in the link you posted

Hi, in a project I'm working to I've built a simple subpatch with all counters and event management. Everything was working well. Suddenly, don't know why or what happened, if I try to open to edit the subpatch object this is not anymore possible, no canvas opens and I don't know khow to recover what inside. Strange (for me...) thing is that the main program still works, as if the time mng subpatch were still present.
Could someone please help? At least to recover the project inside this subpatch.
I'm using PD vanilla 0.53.2 under Windows OS.
Thanks

My first realization with Pd Vanilla, based on Joahnnes Kepler "Harmonices Mundi" (1619). A simple video mounted to highlight the planets sound.

Thanks, that's what I'm looking for, for the time being. I confirm it perfectly works with Vanilla (on Windows).

@alexandros & @oid, in my file /etc/security/limits.conf there were no one of the two lines suggested. So I added them
@audio - rtprio 90 # maximum realtime priority
@audio - memlock unlimited # maximum locked-in-memory address space (KB)

and...
the warning on priority 6 disappeared!
Something magic should be happened
Thanks a lot

@oid unfortunately priority 6... still present after restart. As told, if I run from terminal "sudo puredata", no error/warning message. Can't understand, but I guess it's a problem of my Linux knowledge, not of Puredata

@alexandros: done, after adding myusrn to the audio group I get
$ grep audio /etc/group
audio29:pulse,myusrn

but priority 6 message is still present

Update.

Removed and reinstalled all the libraries in a new folder: everything seems to work!

Thanks to all, herafter some comments.

If I run PD as root, "sudo puredata", the message 'priority 6 scheduling failed; running at normal priority' disappears. By the way, even if I opend directly the patch, so with the above error message, everything related to audio seems OK. So that's good, even if not so clear to me what happen...

[envgen] issue
Does [envgen] work if you call it with its full name including library name, [ggee/envgen]? -> No, it is not recognized (dashed box, not continuos line, for the object appears in the canvas)
Do other objects from ggee work? -> No, same dashed box
Do any other externals work? -> not fully clear, for instance the object [counter] that should be part of cyclone works, other object tried not
Path are set in the correct way, and is not clear to me what to do to install library with Deken.

I'm getting lost, what disappoints me is that on Windows I got no issue, but I'm trying to switch to Linux...

Hi, this is my first post. Started a couple of months ago studying PD. I'm using it on a Windows desktop and now also on a Linux based laptop. I've installed release 0.52 on both OS, with some external libraries. The object [envgen] of ggee works perfectly under Windows. Nothing to do with LinuxMint. I've the error message
"priority 6 scheduling failed; running at normal priority envgen 200 140 1 0 ... couldn't create".
I've set the correct path in preference. The library is present but it seems PD cant't find envgen when run in Linux.
Any help? What I'm doing wrong?
Thanks a lot