Keven,
The Sysdeo plugin makes both classloader and configuration file modifications to your Tomcat configuration. These modifications are incompatible with MyEclipse. In order to test MyEclipse properly, I’d suggest you create a clean Eclipse 2.1.1 installation in parallel with your current one and install MyEclipse on that. Additionally, you’ll probably need to also have another Tomcat installation. This is much more reliable than trying to manually back out the Sysdeo modifications. Once you have a full parallel environment configured you shouldn’t have any problems and you can then evaluate both products and make an informed decision.
–Scott
MyEclipse Support