WHY Do i get This Error?

 
There has been a critical error
Time : 2006.06.18 13:41
Program : Client Terminal
Version : 4.00 (build: 193, 03 May 2006)
Owner : MetaQuotes Software Corp. (MetaTrader)
OS : Windows XP Professional 5.1 Service Pack 2 (Build 2600)
Processors : 1, type 586, level 15
Memory : 2097151/2097151 kb
Exception : C0000005
Address : 004C12FF
Access Type : read
Access Addr : 031E3698

Registers : EAX=FFFFFFFF CS=001b EIP=004C12FF EFLGS=00010206
: EBX=030A4B5C SS=0023 ESP=015DB86C EBP=030A4B5C
: ECX=031E3694 DS=0023 ESI=031E3694 FS=003b
: EDX=00E0B6E8 ES=0023 EDI=031E2F58 GS=0000

Stack Trace : 75530074 00000000 00000000 00000000
: 00000000 00000000 00000000 00000000
: 00000000 00000000 00000000 00000000
: 00000000 00000000 00000000 00000000
Modules :
1 : 00400000 0028D000 C:\Archivos de programa\MT4span\terminal.exe
2 : 20000000 002D6000 C:\WINDOWS\system32\xpsp2res.dll
3 : 5B150000 00038000 C:\WINDOWS\system32\UxTheme.dll
4 : 5B480000 00007000 C:\WINDOWS\system32\umdmxfrm.dll
5 : 5D160000 00007000 C:\WINDOWS\system32\serwvdrv.dll
6 : 61DF0000 0000E000 C:\WINDOWS\system32\MFC42LOC.DLL
7 : 62E30000 00009000 C:\WINDOWS\system32\LPK.DLL
8 : 66740000 00059000 C:\WINDOWS\system32\hnetcfg.dll
9 : 719D0000 00040000 C:\WINDOWS\system32\mswsock.dll
10 : 71A10000 00008000 C:\WINDOWS\System32\wshtcpip.dll
11 : 71A20000 00008000 C:\WINDOWS\system32\WS2HELP.dll
12 : 71A30000 00017000 C:\WINDOWS\system32\WS2_32.dll
13 : 72C90000 00008000 C:\WINDOWS\system32\msacm32.drv
14 : 72CA0000 00009000 C:\WINDOWS\system32\wdmaud.drv
15 : 73D50000 000FE000 C:\WINDOWS\system32\MFC42.DLL
16 : 74D20000 0006B000 C:\WINDOWS\system32\USP10.dll
17 : 75160000 0002E000 C:\WINDOWS\system32\msctfime.ime
18 : 76330000 00005000 C:\WINDOWS\system32\MSIMG32.dll
19 : 76340000 0001D000 C:\WINDOWS\system32\IMM32.DLL
20 : 76360000 0004A000 C:\WINDOWS\system32\comdlg32.dll
21 : 76B00000 0002E000 C:\WINDOWS\system32\WINMM.dll
22 : 76BF0000 0002E000 C:\WINDOWS\system32\WINTRUST.dll
23 : 76C50000 00028000 C:\WINDOWS\system32\IMAGEHLP.dll
24 : 770F0000 0008C000 C:\WINDOWS\system32\OLEAUT32.dll
25 : 773A0000 00102000 C:\WINDOWS\WinSxS\X86_Microsoft.Windows.Common-Controls_6595b64144ccf1df_6.0.2600.2180_x-ww_a84f1ff9\COMCTL32.dll
26 : 774B0000 0013D000 C:\WINDOWS\system32\ole32.dll
27 : 77A50000 00095000 C:\WINDOWS\system32\CRYPT32.dll
28 : 77AF0000 00012000 C:\WINDOWS\system32\MSASN1.dll
29 : 77B10000 00022000 C:\WINDOWS\system32\apphelp.dll
30 : 77BA0000 00007000 C:\WINDOWS\system32\midimap.dll
31 : 77BB0000 00015000 C:\WINDOWS\system32\MSACM32.dll
32 : 77BE0000 00058000 C:\WINDOWS\system32\msvcrt.dll
33 : 77D10000 00090000 C:\WINDOWS\system32\USER32.dll
34 : 77DA0000 000AC000 C:\WINDOWS\system32\ADVAPI32.dll
35 : 77E50000 00091000 C:\WINDOWS\system32\RPCRT4.dll
36 : 77EF0000 00047000 C:\WINDOWS\system32\GDI32.dll
37 : 77F40000 00076000 C:\WINDOWS\system32\SHLWAPI.dll
38 : 7C800000 00101000 C:\WINDOWS\system32\kernel32.dll
39 : 7C910000 000B6000 C:\WINDOWS\system32\ntdll.dll
40 : 7C9D0000 0081F000 C:\WINDOWS\system32\SHELL32.dll

Call stack :
004C12E0:001F [004C12FF] ?IndexOf@CObjectTable
 
Please send me mail to stringo AT metaquotes DOT ru to solve the problem. We need to reproduce this bug.

1. How often does this crash happen?

2. Do you notice any regularty in these crashes?

3. Is anything (expert, script, custom indicator, etc.) working when the crash happens?
 
Thanx for your help. Bug is found and fixed.

Updated build coming soon
Reason: