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sprintf & snprintf issue

Other Parts Discussed in Thread: SIMPLICITI, CC1120, MSP430F5437A

Hello,
I'm posting this in both "StarterWare" & "Low Power RF Tools" since I'm not sure where would be the correct location. 

I'm using simpliciti stack with MSP430F5437A host (yes we use CC1120 as transceiver).
Using CCS v5.3.0.00090.
The project stack in the project is 400 Byte & heap is 0x400 as advised in tips for using printf.

I have a function in a file with the name test.c the function has C functions like sprintf/snprintf in it. 
It works OK.
Yesterday I've added a very close function to test.c which uses  the same code with different values. 

Both functions are called from same location in same flow, both functions input is (mrfiPacket_t *)
In the original functions the ptr doesn't change, in the new function it changes during the first sprintf or snprintf call. 

Currently I'm working on a workaround like this but... 
I would really like to understand & learn more about this. 

Best regards.