Welcome in the forum, DG.
Is there any reason why you do not use latest version TCPWM v2.0?
Can you post your complete project, so that we all can have a look at all of your settings? To do so, use
Creator->File->Create Workspace Bundle (minimal)
and attach the resulting file.
And what output do you get? Is the frequency wrong, or the duty cycle?
Duty cycle can't adjust over about 500us.
I solve this issue.
My problem is my client company's schematic.