I'm trying to help a colleague who is using Webwork problems that were developed for his course by me and others. All was well for the first 5 Homeworks which usually included figures of circuits. These must have displayed previously since there were no complaints. All of a sudden with HW6, the figures don't display - they have a blank box. The rest of the problem works and if we post the figures for the problems, the student can enter the answers and get proper checking.
I've tried several things checking macro files and course configuration. Copying his problems to othe classes - they work fine there.
A typical error message is
The macro alias cannot create a link from
The macro alias was unable to form a URL for the auxiliary file |ECE331_Circuit_hw4_Sum16_7.jpg| used in this problem
I have checked and the images, e.g. ECE331_Circuit_hw4_Sum16_7.jpg, are available in the right folder.
Any suggestions on where to look for the problem?