Hi, as a novice xotcl user I found the following crash. % package req XOTcl 1.5.3 % namespace import ::xotcl::* % Object x ::x % x configure -set Speicherzugriffsfehler I got the same behaviour with a self build xotcl extension (IRIX system, tclkit, tcl version 8.5) and with the last ActiveTcl 8.4 version under linux. rene