hi rajnish;
well, as ubergrid is a premium theme I can’t download & test it myself, so can’t really help you there.
as per the faq; first try with only HTML optimization. if that works, add CSS optimization (disable CSS optimization if things break). next try JS optimization. try with the “force in head” option, try to combine it with “look only in head”. whoever does it, it will be some trial and error ??
once you’ve done that, feel free to report back here on what works and what does not (including a description of what exactly is wrong) and we can see what the next steps would be.
good luck,
frank