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Installed tabs: - 'Reload Plugins', 'Update All', ... are enabled during reload. Thus user might trigger another (likely parallel) reloads. Consequences? - During reload there is one 'Please wait...' "item". When user clicks it 'Uninstall' and 'Update' buttons react to it. Click it them -> consequences? List should be disabled during reload. Likely the same for other tabs.
I'll leave non-critical issues in the plugin manager post 6.5; possibly do then a larger overhaul and try to the same code base as the gem manager.
Downgrading as no "real" issues have been reported that would have been caused by this.