I upgraded to EBMM 4 last week and have encountered the following message when trying to validate the CSS on my website.
295 #mbrfzqebul_table div.gradient_button Value Error : background-image top is not a color value )
301 #mbrfzqebul_table li:hover div.gradient_button, #mbrfzqebul_table li.expanded div.gradient_button, #mbrfzqebul_table li.active div.gradient_button, #mbrfzqebul_table li.itemhot div.gradient_button Value Error : background-image top is not a color value )
313 #mbrfzqebul_table ul li.gradient_menuitem:hover, #mbrfzqebul_table ul li.gradient_menuitem.subexpanded, #mbrfzqebul_table ul li.gradient_menuitem.subitemhot Value Error : background-image top is not a color value )
I removed the TOP from the gradient variables and the site would validate okay. Just thought you might want to know this.
There are also 8 warnings for unknown vendor extensions.
My site is http://lakehalice.com and there is a button in the footer to access html and css validation sites.