Dear Shankar,
I once got crystals with Ethylene glycol as precipitant but at low concentration (8-14%) and there always had been spots right from the beginning.
It sometimes happens that you get nice looking crystals but they do not diffract. If you have hits from other conditions may be you should try to improve these. From the mentioned case I got several conditions but all contained different types of alcohol like MPD, iso-Propanol, Ethanol so I would assume there is a chance you might find a different crystal form among these precipitants.
In my case the final trick was to add a cofactor which dramatically changed the crystallization conditions and crystal quality.
Good luck,
Ulrike
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