I have just installed Eclipse 3.1M4 and I noticed that the JSP editor did not work.
MyEclipse does not currently support the M-builds of Eclipse 3.1, we are working on syncing up a release of MyEclipse compatible with Eclipse 3.1 as it approaches RC stage so it will be inline with the release.
Any suggestion on what may be going wrong. The JSP pages come up as regular text.
With the above note in mind, try right clickc on the JSP file > Open With > MyEclipse JSP Editor. If it isn’t there, please install against Eclipse 3.0.1 for the best experience.