I don't know if this counts as a bug, but I opened a cupboard on a slightly (1-2 updates) amber client, and..
1.61.6.b90118f9
Windows 7 6.1 x64, 1.8.0_101 amd64
ATI Technologies Inc. (ATI Radeon HD 5450) - 4.4.13399 Compatibility Profile Context 15.200.1062.1004
java.lang.NoSuchMethodError: ISlots$SItem.<init>(LISlots;Lhaven/ResData;[Ljava/lang/Object;)V
at Fac.build(slots.cjava:31)
at haven.ItemInfo.buildinfo(ItemInfo.java:376)
at haven.GItem.info(GItem.java:146)
at haven.WItem$AttrCache.get(WItem.java:159)
at haven.WItem.draw(WItem.java:237)
at haven.Widget.draw(Widget.java:696)
at haven.Widget.draw(Widget.java:701)
at haven.Inventory.draw(Inventory.java:59)
at haven.Widget.draw(Widget.java:696)
at haven.Widget.draw(Widget.java:701)
at haven.Window.draw(Window.java:200)
at haven.Widget.draw(Widget.java:696)
at haven.Widget.draw(Widget.java:701)
at haven.GameUI.draw(GameUI.java:648)
at haven.Widget.draw(Widget.java:696)
at haven.Widget.draw(Widget.java:701)
at haven.RootWidget.draw(RootWidget.java:67)
at haven.UI.draw(UI.java:139)
at haven.HavenPanel.rootdraw(HavenPanel.java:342)
at haven.HavenPanel.run(HavenPanel.java:600)
at java.lang.Thread.run(Unknown Source)