Hi I am working with the matrix libraries (#include "boost/numeric/ublas/matrix.hpp" etc...) and my program is running fine during several loops but suddenly stops, showing the message: *** glibc detected *** malloc(): memory corruption: 0x0865e638 *** /bin/sh: line 1:  8311 Aborted I found that the error occurs on the line where I initialize some matrices: matrix Stiff_matrix(6,6), Qq_matrix(3,3); What I don't understand is, that the program runs through this line the first 3 times and only the 4th time the error occurs.... How can that be?? Greets, Dan. -- 10 GB Mailbox, 100 FreeSMS/Monat http://www.gmx.net/de/go/topmail +++ GMX - die erste Adresse für Mail, Message, More +++