|These can be hard to trouble shoot.
One thing to remember is that often the browser
will not update an image, even when you click reload. A good practice is to hold the shift
key down as you click reload since this is more likely to force the graphics to reload.
Trouble shoot path -- with .html file if needed
Next, can you call the graph up directly, e.g. by clicking on the
non-displaying graph to
get an enlarged version, or by entering what should be the correct
address directly into the webbrowser. If you can't view the graph that
way there is a reasonable chance that either
the .gif file itself or one of the directories above it doesn't have
the correct permission.
This can be quite tedious to track down. Place a .gif file that you
know works in the appropriate
directory and see if you can view that -- or just place a text file
there. Make sure the path is clear all the way from the top directory
to the target file.
The URL usually points to some top level directory accessed by the
webserver. There may need to be a link from this directory (or one of
its subdirectories) to the directory
containing the .gif file. You might have forgotten to create this link
for one of your courses.
I hope this helps some. Mostly it takes patience, I've spent more than my share of hours
tracking down permission problems or missing links in paths.
Let me know if it turns out to be something else. We'll add it to the checklist.
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