不知怎地，Eclipse始终停留在Loading workbench状态。反复重启，状态依旧。尝试解决。
停止时显示的状态:”Loading workbench”，看来和这个workbench插件有关。查看原来的.metadata/.plugins目录，在众多文件夹中
om.collabnet.subversion.merge org.eclipse.search
org.eclipse.compare org.eclipse.team.core
org.eclipse.core.resources org.eclipse.team.cvs.core
org.eclipse.core.runtime org.eclipse.team.ui
org.eclipse.debug.core org.eclipse.ui.ide
org.eclipse.debug.ui org.eclipse.ui.intro
org.eclipse.dltk.core org.eclipse.ui.views.log
org.eclipse.dltk.core.index.sql.h2 org.eclipse.ui.workbench
org.eclipse.dltk.ui org.eclipse.ui.workbench.texteditor
org.eclipse.epp.usagedata.recording org.eclipse.wb.discovery.core
org.eclipse.jdt.core org.eclipse.wst.internet.cache
org.eclipse.jdt.ui org.eclipse.wst.jsdt.core
org.eclipse.ltk.core.refactoring org.eclipse.wst.jsdt.ui
org.eclipse.ltk.ui.refactoring org.eclipse.wst.jsdt.web.core
org.eclipse.m2e.core org.eclipse.wst.sse.ui
org.eclipse.m2e.logback.configuration org.eclipse.wst.validation
org.eclipse.mylyn.bugzilla.core org.eclipse.wst.xml.core
org.eclipse.mylyn.tasks.ui org.tigris.subversion.subclipse.core
org.eclipse.php.core org.tigris.subversion.subclipse.graph
org.eclipse.php.ui org.tigris.subversion.subclipse.ui
发现了两个：org.eclipse.ui.workbench和 org.eclipse.ui.workbench.texteditor。
不管三七二十一，删了这两个目录，重新启动eclipse。正常启动且原项目信息正确加载。
经测试，只需要删除org.eclipse.ui.workbench就可已了，不过推荐大家将原来的文件重命名。