HI , I have the same Issue. I also filed MTR and my MTR status show Initial Review and old receipt number show Post decesion activity.
Will you please let me know what happened with your case as we both are in the same boat.Also how long does uscis takes to give the decison once said reopened.
Here is the status messages for both
MTR(I-290B): Initial ReviewOn July 24, 2013, we received this I290B NOTICE OF APPEAL TO THE COMMISSIONER, and mailed you a notice describing how we will process your case. Please follow any instructions on this notice. You will be notified by mail when a decision is made, or if the office needs something from you. If you move while this case is pending, please use our Change of Address online tool to update your case with your new address or contact our customer service center at 1-800-375-5283.
Old Receipt(I-129)
Post Decision Activity
On January 15, 2014, we mailed you a notice informing you that your I129, PETITION FOR A NONIMMIGRANT WORKER, was reopened. If you have not received the notice within 30 days of the date above, please call customer service at 1-800-375-5283 for further assistance. If you move, please use our Change of Address online tool to update your case with your new address.