Ok cool. I will make a test build with Tcl/Tk 8.6.10:

Pd-0.51-0-tk8610.zip

On my system, I can confirm that the canvas window background is no longer white by default, so IOhannes patch to force this is required.

On Jul 15, 2020, at 11:25 AM, pd-list-request@lists.iem.at wrote:

Date: Wed, 15 Jul 2020 11:25:37 +0200
From: Antoine Villeret <antoine.villeret@gmail.com>
To: Pd-List <pd-list@lists.iem.at>
Subject: Re: [PD] Pd 0.50-2 on macos 11.0 BigSur beta
Message-ID:
<CAGn5wNcmGG2mEZAW_s9DUmeDnkjEmuPhpjTYsdioF3_iDVFDkg@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

You're right Dan, using Wish 8.6.10 works.
8.6.7 doesn't.

So upgrading WIsh is the key.

Thanks for your support

Best

Antoine

--------
Dan Wilcox
@danomatika
danomatika.com
robotcowboy.com