Using velocity automation in the past has been very useful. But on my current project, changes I make on the velocity line (double clicking to make edit points, the creating ramps on the line) are having no impact on the speed of the clip. (Similarly, if at the left of the clip I pull the whole velocity clip up and down, the position of the line has no impact on the playback speed.) I've always used this feature successful in the past. Have I inadvertently changed a setting elsewhere in Vegas Pro that disables this function? Thanks in advance for any help.

Vegas Pro 19

Intel i7-7700K CPU @ 4.20 GHz
Operating system: - Windows 10
Memory: 32 GB
Graphics Card: - NVIDIA GeForce GTX 1060 6GB (up do date)
Vegas program is loaded on internal SSD