New Site Can't Be Found on Google with "site:"

I have a fairly new site less than a month old. I was using site:http://www.onestop-directory.com to check the indexed pages on Google, and it had a steady increase every day. Last weekend site query gave over 130 results, but since yesterday google doesn't show up anything. But my site is still indexed. If I search for site:http://www.onestop-directory.com keyword , I get results.
What would be the reason? Would it be connected to Sandbox Effect since it's a brand new domain and site?
Thanks in advance

 

Results 1 - 10 of about 133 from www.onestop-directory.com for . (0.53 seconds)

All fine here...

 

Thanks TOPS30 for checking. I just checked again, and still no results. I will keep checking and see if I get results.

 

http://www.google.co.uk/search?sour...utf-8&q=site:http://www.onestop-directory.com

Is my search URL... On McDar.com you can check individual datacentres.

 

I've never been able to get mcdars tool to work - approx how long do you have to wait and what browser does it work best on?

 

I had this same issue earlier in the week.

Usually when an update is in progress (backlink in this case), you lose some of the datacenters. After a few days the pages will show up again. This doesn't hurt your SERPs at all.

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Thank you all. I thought the same, but I was suspicious for a second. I've checked the other data centers. My site shows up on all of them except two, I'll wait and see.