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Bug in Disassembly window/functionality

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Indrekis:
I have encountered  strange bug in "built-in" disasm feature. While I am disassembling some function, sometimes text in Disassembly window lacks some lines of asm code, or even just parts of line.
For example, sometimes instead of real code, the:


--- Quote ---0x401317   fld      QWORD PTR [ecx+eax*8]
0x40131a   mov    ecx,DWORD PTR [ebp+8]
0x40131d   fadd   DWORD PTR [ecx+eax*8]
0x401320   mov    ecx,DWORD PTR [ebp+16]
0x401323   fadd    DWORD PTR [ecx+eax*8]

--- End quote ---

I obtain


--- Quote ---0x401317   fld      QWORD PTR [ecx+eax*8]
0x40131a   mov    ecx,DWORD PTR [ebp+8]
0x401320   mov    ecx,DWORD PTR [ebp+16]
0x401323   fadd    DWORD PTR [ecx+eax*8]

--- End quote ---

or

--- Quote ---0x401334   call   0x438ea0 <clock>
0x401339   mov    esi,DWORD
0x40133c   mov    ebx,DWORD PTR [esi]

--- End quote ---

instead of

--- Quote ---0x401334   call   0x438ea0 <clock>
0x401339   mov    esi,DWORD PTR [ebp+40]
0x40133c   mov    ebx,DWORD PTR [esi]

--- End quote ---

This bug do not occurs  every time. For example, if I _open_ the windows and save to file several times successively, some obtained files will be "damaged", other - not.

As for now I do not managed to reproduce this bug in simple project  :(

I am using CodeBlocks, built from sources,  revision 2977, with the exception that it is built against non-monolithic wxWidgets (2.6.3)  library, under WindowsXP SP2.
Debugger  - gdb from mingw package, version 6.3


If it can help, code which I am working on can be found in svn repository at
http://OpenSVN.csie.org/C_vs_Cpp_numerical_tests
But it is of no interest, except of been known to reproduce this bug at least for function
check_C_ApBpCpD_double_fn_time  8)

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