Dear QATAR_FSW4131
I and you seem to have sent our full applications to London CHC in the same week: mine got delivered to them on February 1, 2010 and they issued an acknowledgement on February 4, 2010. I am totally surprised that you never received any AOR. However, since your E-cas status is 'Received By Visa Office' this means that your application and supporting documents have been received and entered into the system: so really nothing to worry about the AOR. I guess your application is currently awaiting a final eligibility review by a Visa Officer.
My advice to you would be this: send a case specific enquiry, using the web-form https://dmp-portal.cic.gc.ca/cicemail/intro-eng.aspx?mission=singapore and ask them if they have assigned your application a new file number, and also whats happening with your application at this point. I really think they will reply! So write to them.. NOW!
// OB