Category Links not working

I cannot view category views for any category that is the child of another.

For example:
MyCategory
– MySubcategory

Although all the wordpress generated category lists show “MySubcategory” (with a post count), when I click on the Subcategory link, the resulting page says that no posts are found.

It’s sending me to:

/archives/category/mycategory/mysubcategory/

Which shows no posts.

I’ve tried manually going to

/archives/category/mysubcategory/

but it too shows no posts.

Anyone know what I might be doing wrong?

Thanks in advance.