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Hello. My name is Michael. I can help you with your question.
The Optoma ZF2300 glasses are compatible with BC300 emitters only; they are not compatible with the older generation RF emitters. Can you please check and make sure that what you have is the BC300? Other than that, they must be connected to the 3D sync out on the projector in order to sync the shutters with the source.
Are the glasses fully charged?
Also, when you look through them, can you see through both lenses, even though they are dim, or only one side?
Have you tried switching the 3d mode to DLP link and then back to VESA? Those are definitely VESA glasses, but it sounds like the projector isn't recognizing them.
What about the content. Does the 3d content appear as it should when in 3d mode? "as it should" is blurred/double image.