popen in php geht nicht

[MrWolf]

save_mode ist auf off

hier zum vergleich die phpinfo:

allow_call_time_pass_reference
On On
allow_url_fopen
1 1
always_populate_raw_post_data
0 0
arg_separator.input
& &
arg_separator.output
& &
asp_tags
Off Off
auto_append_file
no value no value
auto_prepend_file
no value no value
browscap
no value no value
default_charset
no value no value
default_mimetype
text/html text/html
define_syslog_variables
Off Off
disable_functions
no value no value
display_errors
On On
display_startup_errors
Off Off
doc_root
no value no value
enable_dl
On On
error_append_string
no value no value
error_log
no value no value
error_prepend_string
no value no value
error_reporting
no value no value
expose_php
On On
extension_dir
/usr/local/lib/php/extensions/no-debug-non-zts-20010901 /usr/local/lib/php/extensions/no-debug-non-zts-20010901
file_uploads
1 1
gpc_order
GPC GPC
highlight.bg
#FFFFFF #FFFFFF
highlight.comment
#FF8000 #FF8000
highlight.default
#0000BB #0000BB
highlight.html
#000000 #000000
highlight.keyword
#007700 #007700
highlight.string
#DD0000 #DD0000
html_errors
On On
ignore_user_abort
Off Off
implicit_flush
Off Off
include_path
.:/usr/local/lib/php .:/usr/local/lib/php
log_errors
Off Off
magic_quotes_gpc
On On
magic_quotes_runtime
Off Off
magic_quotes_sybase
Off Off
max_execution_time
30 30
open_basedir
no value no value
output_buffering
0 0
output_handler
no value no value
post_max_size
8M 8M
precision
14 14
register_argc_argv
On On
register_globals
On On
safe_mode
Off Off
safe_mode_exec_dir
1 1
safe_mode_gid
Off Off
safe_mode_include_dir
no value no value
sendmail_from
no value no value
sendmail_path
/usr/sbin/sendmail -t -i /usr/sbin/sendmail -t -i
short_open_tag
On On
SMTP
localhost localhost
sql.safe_mode
Off Off
track_errors
Off Off
upload_max_filesize
2M 2M
upload_tmp_dir
no value no value
user_dir
no value no value
variables_order
no value no value
xmlrpc_error_number
0 0
xmlrpc_errors
Off Off
y2k_compliance
Off Off