fatal error - cygheap base mismatch detected (2nd attempt)

[tobias schlottke <tobias dot schlottke at secu dot lu>]

Hi

I have a cygwin terminal window open and I try to execute a perl program 
and get the following message:

=======
      5 [main] perl 8172 C:\cygwin\bin\perl.exe: *** fatal error - 
cygheap base mismatch detected - 0x61239790/0xC79790.
This problem is probably due to using incompatible versions of the 
cygwin DLL.
Search for cygwin1.dll using the Windows Start->Find/Search facility
and delete all but the most recent version.  The most recent version 
*should*
reside in x:\cygwin\bin, where 'x' is the drive on which you have
installed the cygwin distribution.  Rebooting is also suggested if you
are unable to find another cygwin DLL.
=======

The cygwin1.dll is in the c:\cygwin\bin directory and additionally on a 
different place at c:\Program Files\openFT\bin\cygwin1.dll which is not 
in my PATH.
(Both files are identical).

At the time of the error I had a second cygwin terminal already open. 
After the failure in the first window I executed the command in the 
second one and it executed successfully.
The funny thing is: If I try in the first window again, it runs fine....

a) Why?
b) What do I have to change to make it run always?

Things I tried:
Reboot, rebaseAll.

System:
Windows 7 Enterprise Ver 6.1 Build 7600

Cygwin:
 2586k 2010/08/31 C:\cygwin\bin\cygwin1.dll
    Cygwin DLL version info:
        DLL version: 1.7.7
        DLL epoch: 19
        DLL old termios: 5
        DLL malloc env: 28
        Cygwin conv: 181
        API major: 0
        API minor: 230
        Shared data: 5
        DLL identifier: cygwin1
        Mount registry: 3
        Cygwin registry name: Cygwin
        Program options name: Program Options
        Installations name: Installations
        Cygdrive default prefix:
        Build date:
        Shared id: cygwin1S5

Any hints appreciated.
Thanks,
Tobias






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