Lead Import to a Boolean field fails

Lead Import to a Boolean field fails

I have setup several custom, boolean fields in my Lead table they are NOT "Enable by Default".

It is used to indicated the product/services that we offer and that the client may be interested in and then when converted to a Potential/Contact will indicated the services we are providing and the ones that we are not.

I am importing specific product leads and created a column and mapped to the field but I can not get the imported leads to show that value checked off.
I have tried the following; the word of the field, X, x, Yes. Not sure what is left.

Is this even possible to import leads and activate a boolean field and if so how?

Thank you in advance for any assistance.
-g-