Using the latest Plug-in under Eclipse 3.3, markers (little red Xs) get set when editing a workflow when you make a mistake or refer to a state that you have not yet created.
They do not get cleared when you fix the mistake. Eventually, your file gets full of spurious markers so it is hard to find the real ones.
The only way to get rid of them is to shutdown Eclipse and go into Eclipse's metadata and delete the .markers file.
This gets rid of all of your markers in all of your files which is not a "good thing". They do come back when you edit the file if the errors are still there so it is not fatal. It is a PITA.
Is this a known bug?