Default GI presets have changed in different versions since version 1.x up to now.
Add a V-Ray plane under chairs
In environment tab,in front of "GI", check that if the "m" is "M" then it has a "Sky map" that is called "Tex_Sky", set it to none, so that , you see the "m" sign ( not capital M).
render again
Aside of these , if you are going to save a huge time in learning , you may find my ebook, as a handy tool.