0010157: Crash when opening 8.12 projects on 9.0 that contains VST3 plugin with more than 2 channels.

ID	Project	Category	View Status	Date Submitted	Last Update

0010157	ardour	bugs	public	2026-02-05 18:54	2026-02-05 18:54

Reporter	DopplerNyquist	Assigned To
Priority	normal	Severity	crash	Reproducibility	always
Status	new	Resolution	open
Platform	Linux	OS	Debian	OS Version	13
Product Version	9.0

Summary	0010157: Crash when opening 8.12 projects on 9.0 that contains VST3 plugin with more than 2 channels.
Description	Every time I try to open a project made on 8.12 that have a VST3 plugin with more than 2 audio output channels Ardour 9 craches, noticed with Geonkick.
Steps To Reproduce	Just try to open the project, Ardour 9 crashes and closes.
Additional Information	- I tested "Safe Mode", and it loads. - On safe mode, I removed the plugins that where using 3 or more output ports, and after this the project loads. - The same problem occurs when I try to add Geonkick VST3 on Ardour 9. - The version "single" of Geonkick (that have only stereo output) does not cause any problem. - The LV2 versions apparently doesn't have the issue. I created some tracks with LV2 versions of the same plugin, without any problem. - Until now, I believe that there are some issue with VST3 and multiple output ports.
Tags	No tags attached.

Date Modified	Username	Field	Change
2026-02-05 18:54	DopplerNyquist	New Issue