** Using WeBWorK **

There are a couple of possibilities -- the most likely is that the latex program
is not at /usr/bin/latex but in some other location.

1. Running webwork2/bin/check_modules.pl will give you a list of the locations of programs such as latex, dvipng, mv and many more, plus a list of CPAN modules that should be installed. Check that the paths for say latex agrees with the path listed near the top of the global.conf file. (Eventually we'd like to have check_modules make this comparison automatically -- but we haven't gotten to it yet.) There is an even greater likelihood that the path for dvipng is /usr/local/bin/dvipng or something else. (You can also type "which dvipng" to find the address of the installed dvipng program.)

2. If the paths to the programs and files all look correct then check the permissions on the directories involved and make sure that the webserver can
create files and subdirectories in them.

3. If things are still not working there is a debugging parameter in lib/WeBWorK/Constants.pm :

# If true, don't delete temporary files
#
$WeBWorK::ContentGenerator::Hardcopy::PreserveTempFiles = 1;

which you should set to 1. This preserves the temporary files made during the image creation process which you can inspect for additional log files, error messages and so forth.

Hope this helps.

-- Mike