Editing the ROI is not working

Dear Pix4D Support Team,

I am experiencing a critical bug in Pix4Dmatic v2.6.0 on Windows 11.

When editing an existing ROI polygon, the vertex nodes are completely frozen and cannot be moved. Every attempt fails with the error: “Input polygon is invalid”. This fully blocks my ability to edit the ROI and continue my work.

I have attached screenshots of the issue and the error log for your reference.

Please advise on a fix or workaround as soon as possible.

Best regards,
Humayun Sajjad
Octacon Geotechnik GmbH