Can't go forward after backward from the last photo of an album

I have just notice a small issue on  booh 8.5 running on

Mozilla 1.4.2 for AIX
Mozilla/5.0 (X11; U; AIX 00523DFA4C00; en-US; rv:1.4.2) Gecko/20040309

Can't test on Firefox, IE or other until I get back on my computer this
Sunday.

When a click on a gallery, then I click the latest picture of that
gallery, then I click to see the precedent picture, then I can't go
forward to see the latest picture as the button is still desactivate 

If I go back to the thumbnails, then I click on any of the pictures
except the latest one, then I can go forward until the latest, go
backward and then forward again without any problem.

It's just when I click on the latest picture from the thumbnail view
that I can't go forwrard after having to move backward.

Anyone having the same issue?

Hope you've understood me...