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C51: Start_XC.A51 compiled wrong in 9.55??

Hi, I've tried to compile the same project originally developed with version 9.51 under the latest 9.55.

The two .hex files are identical except for one byte.
Looking at the .map and at the start_xc.a51 files i've seen that it's the init value of the stack.

In 9.50 it's set to 0x7B, in 9.51 to 0x13. The result is unexpected behavior of the program.

Anybody can confirm this?

Thank you,

John