alt131 - 10:56 pm on Aug 17, 2012 (gmt 0)

Hi mcharalambous and welcome to css,
It does make sense! I'm just not sure of the exact source of the issue. What happens when you set the desired background-color on the sub-nav elements (or the element creating the "bar", then change it to white on :hover? Also are you sure the sub-nav/other element has been hidden so it only becomes visible on :hover?