When java files are stored on a network location sometimes you can make a change to the file save it and then compile and it will compile the previous version of the file without the changes. To work around this we have to place the file on a local drive and then compile. These files are stored on a Windows File share and accessed from a mapped drive.
We need to know a little bit more about your system to fix this bug. Please go to "Help -> About" and click on "System Properties". Then, click the "Copy System Properties" button and paste the results here in a new comment.
Thanks,
The DrJava Team