What does a pink background and the message “* Use of uninitialized value in join at (eval 111) line 2406” at the bottom of the screen mean?
This usually means you have answered the question before, and your answer caused a syntax error. You can eliminate the pink screen by erasing the offending answer and submitting a blank answer, or of course by answering the problem correctly. • Parts of my problem are missing — I see a broken image instead of an equation. There is a bug in WebWorK that occasionally causes this to happen. It can’t be predicted, but it can be fixed after it is reported. If you have broken images so that the equations are not showing up in your problem, you can still answer the problem. Remember, you are not penalized for wrong answers, so as long as the answer blanks appear you can enter your answers. Try this: • Get a hard copy (PDF file) of the problem set. It will show the compete problem, and you can work it and answer it online. • Display the problem in formatted text, or text only mode. These both work when images fail to display, and render the math as closely as possible to what is intended.
