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Cygheap issue with Nios II tools

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Hello everyone,

I'm facing an error from time to time when I execute nios2-xxx tools or when I start debugging in Nios II Eclipse.
-> I'm getting a cygwin error as follows:

Code:

      0 [main] perl (5284) C:\altera\13.0sp1\quartus\bin\cygwin\bin\perl.exe: *** fatal error - cygheap base mismatch detected - 0x612708D0/0x8208D0.
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.
/cygdrive/c/altera/13.0sp1/nios2eds/bin/sh_pl.sh: line 2:  5372 Segmentation fault      PERL5LIB=`cygpath -u "$SOPC_KIT_NIOS2/bin"` perl "${SH_PL:-$0.pl}" $@

I've already found some posts in the net about this issue related to Win7 64bit, but didn't try them yet since I don't want to ruin my Quartus installation.
Btw, I have no other cygwin installation on my system.

Is there any solution to avoid that error and also avoid rebooting the PC?

Best regards

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