Thanks, Almost perfect.
It looks like “Draw in new tab” uses now separate credentials from the original ones.
I “Load” a file (with “credentials”) and “Draw” some canvas.
I then “Draw in new tab” the same canvas but it immediately asks for “credentials” again. This happens only the first time I execute “Draw in new tab” (i.e., using it again for anything else seems to reuse one of the provided “credentials”).