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4.18M3. The close X on the Welcome page tab has vanished. Workaround: Minimize the window, then select Close from the closed icon context menu.
This happened to me, too. I took drastic measures and deleted the behemoth file, .metadata/.plugins/org.eclipse.e4.workbench/workbench.xmi and restarted.
Can you attach the workbench.xmi with the problematic (missing) close button? Then it can be investigated where in the model the problem is triggered.