Well as far as my folder UI Skin, i have 4 images for the Deed per tab as you can see on this picture.
The 3 firsts pictures shown are those you can see when you dont highlight (select) a tab.
The last one is the selected TAB and cover all the tab.
And my UI is a japp one too, installed about 6 months before F2P and never changed since except for the xp bar that i totally transformed with Japp agreement.
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THOUGH i think i understand your problem, it seems after i checked some old pictures of the DEED LOGG that there is now a little space between the main window deed log and the tabs (3 first pictures).
I will test something to see if i can remove that space
I finally manage to correct the look :
all tab images must have the size 46x66, i will post a picture once i finished to do them all
here you go :
(sorry for the low image quality but when i work on my UI i put all my graphics to very low or low)