Troubleshooting
A Partial Binder is Created
Condition

Cause
Some of the part's free edges were not selected because they are not tangent continuous throughout.
Remedy
Can't Create an Additional Binder
Condition
I can't create an additional binder. When I try selecting the addendum start edge of an additional binder, it doesn't work.
Cause
On the additional binder, you tried to select an addendum start edge that is was already selected to create an existing binder. Binders cannot share addendum start edges.