Read this post if your FCG doesn't display image

[javaboy]

I spend nearly an hour to figure out the problem, perhaps the admin can look into it.

The solution which I found is the "first letter" of the Categories must be "Capital letter",
example "Sports" not "sports", this solution work for me but no guarantee work for others,
try it out yourself, see if it fix the problem.

[admin]

you can use exact category name or exact category slug for the category name, but the only thing, if your category has spaces in it you must use category slug.