I had the same issue with Eclipse not even starting for me anymore. What I did was to remove everything related to the Scala IDE from both the plugins and the features directories and start Eclipse with the -clean parameter:

./eclipse -clean


In Eclipse 3.5.1, go to Help->About Eclipse, then press 'Installation Details'. In the tab 'Installed Software' you can remove a feature, in the tab 'Installation History' you can revert to a previous configuration. Since you manually removed pieces, it may be too late to fix things.

You can also check the features directory and start Eclipse with the -clean option to ensure that the OSGi bundle cache is cleared.

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