Hi, Are you sure you set the stack size to unlimited? ulimit -S unlimited (under bash) limit stacksize unlimited (tcsh) Yours Björn -- Björn Wallner Stockholm Bioinformatics Center PhD Student SCFAB, Stockholm University bjorn@sbc.su.se S-106 91 Stockholm Tel:+46-8-553 785 66 Fax:+46-8-5537 8214 Cell:070-521 56 65