I have a large ASP.Net project I am working on, and the solution contains about 6 projects. Periodically, it won't compile, but when I look in the Task List there are no errors listed. After a lot of trial and error, I finally found a solution which restores the missing error notations, so that I can fix the problem and move on.

Right-click in the “Task” screen, and select the “Show Tasks/Comments” option. Try compiling, and of course it will fail again. Then, right-click on the “Task” screen again, and select the “Build Errors” option, and they should appear. It seems to work fairly consistantly so I think this “workaround” may actually work.

As an alternative (although not as easy to work with), you can just look at the output window, and filter through the text output. Take your pick, you should be able to see what the problem is!

ADDENDUM: It happened again, and these steps didn't work exactly. To make it work, try to compile again between “right-clicks” and they should appear.