Please check the photograph of the light fixture. All the bulbs have gone out and I cannot get the glass out to replace them. I unscrewed the decorative thing at the bottom. After that I unscrewed another bolt with washer but the glass is not moving. I'm not sure what to do after that. I'm trying to move the decorative thing on top of glass also, but it's moving at all.
Use a credit card as a prying tool on the stubborn glass dome to separate it from the fixture base. Slip the credit card in between the seam like you're slicing a piece of cake.
It should come off easily that way.
The nut in the center should be all that is holding the glass. I think you need to look closely at the edge of the glass where it contacts the fixture for traces of an adhesive someone may have used and maybe pry gently with a plastic tool keeping the nut and washer on the threads like in the picture. Other than that I'm not sure without damaging the fixture.