GSM_GPRSLibrary_SMS prints blank received SMS

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What steps will reproduce the problem?
1. Upload the GSM_GPRSLibrary_SMS example to Arduino UNO
2. I used SUART mode of my GSM shield, that is pins 2 and 3. My GSM shield has 
a switch for SUART mode (pins 2 and 3 as Rx Tx pins instead of pins 0 and 1).
3.

What is the expected output? What do you see instead?

The code should print received SMS to Serial monitor. However, whenever I send 
a message to the inserted SIM card via another mobile device, I notice that the 
scroll bar would move downward but monitor prints blank/nothing. The smsbuffer 
variable from gsm.readSMS()is empty. Though it sensed that a message was 
received. Could there be a problem with my connections? Should I switch Rx and 
Tx pins or redefine Software Serial pins? Thanks!

What version of the product are you using? On what operating system?

SIM900D from SimCom, Arduino 1.0.5, Windows 8

Original issue reported on code.google.com by [email protected] on 15 Dec 2013 at 8:33