Pop up image not centered

Hi all. I just installed ZC 1.3.7 and uploaded a picture to test the pop up image. When I click on the image, the pop up image appeared but the image position is like this:
no top gap
equal side gap
HUGE bottom gap

How do I fix that?
I want the image to be centered. It's fresh install so I haven't change anything.

Thanks in advance for your help.

May I suggest before going any further, download and install v1.3.8a. It is the most recent vesion and contains many bug fixes.

Kim:

May I suggest before going any further, download and install v1.3.8a. It is the most recent vesion and contains many bug fixes.

Hi Kim, thanks for your suggestion. I downloaded and instaled the v1.3.8a, but the image in the pop up window is still not centered. Both versions have the huge white gap on the bottom of the pop up window and no gap at all on top.

Any idea where to fix this?

Thanks in advance.