Analog domain problems - AD9833 to generate waveforms

Hello, I used AD9833 to generate waveforms. I have created 3 types of waveforms and they are selectable by a switch. It worked fine for one week and I was getting sine, triangular and square waves upto 5MHz comfortably. Now, I am facing strange problem.I am able to get square wave but sine and triangular waves are not comming.
I have not changed the microcontroller program that generated the all the waveforms since 7 days. I am debugging the hardware since yesterday. Not able to find the exact reason.
I have checked the voltage at pin no.1(comp) of AD9833. It is 5V. Is it correct?
I have attached screen shots of DSO. first is square wave and 2nd is sine and triangular wave(same output for both the waves). Third ts circuit diagram.
Pls help me.

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Keith

please refer:
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