UI Looks Different on Different PCs

[Cheryl Wheeler]

I've been using Gnucash for a while now. On PC #1, I recently upgraded 
from 2.6.6 to 2.6.12. Before the upgrade, I changed the theme using the 
Theme Selector tool and changed the register colors with a custom 
gtkrc-2.0.gnucash file. On PC #2, I recently did a new install of 2.6.12 
-- this PC had never had Gnucash installed on it before. Both are 
Windows machines (Win 7 Pro and Win 7 Starter).

When I compare Gnucash on the two PCs, I see some different icons (e.g., 
the Save and Quit icons) and some different-looking controls (e.g., the 
styles of the scroll bars and dialog box buttons). Gnucash on PC #1 
looks the same as it did before the upgrade.

Should these differences be expected? Is it caused by my settings or 
something else? It's not causing a problem for me but I'm curious.