Many thanks! I think it is solved now. The
cpymem test clearly showed the missing zero termination of the response string in the cell. This happened for content appended to an error message.
newLISP also stores the size of a memory buffer independent of string zero-termination. Because of this, the error doesn't always show up.
http://www.newlisp.org/downloads/develo ... nprogress/ from 2015-07-21 20:45
Ps: May be newLISP shouldn't prepend and error message to an exsisting server error page at all. Perhaps the error message should only be generated when no page comes back from server after the header.