Delete range stopped not working in V8.0.6

Problem: delete range does not work stopped working for a video I am editing. It was working, and works for other video in the same project. Also, when I created a range, both range copy and range cut are still disabled.

ActivePresenter Version: 8.0.6

OS: Required. window 10 | 64 bits

Hi James,

Please make sure to unlock objects on the Timeline pane by clicking the Lock/Unlock All Objects icon.
image

Best regards,
Thuy