Index: share/jive/slim/SlimServer.lua
===================================================================
--- share/jive/slim/SlimServer.lua	(revision 2090)
+++ share/jive/slim/SlimServer.lua	(working copy)
@@ -479,6 +479,14 @@
 		-- on error, print something...
 		if err then
 			logcache:error("_getArtworkThumbSink(", iconId, ", ", size, ") error: ", err)
+
+			-- free artworkThumbIcons entry
+			local icons = self.artworkThumbIcons
+			for icon, key in pairs(icons) do
+				if key == cacheKey then
+					icons[icon] = nil
+				end
+			end
 		end
 		-- if we have data
 		if chunk then
Index: share/jive/slim/ArtworkCache.lua
===================================================================
--- share/jive/slim/ArtworkCache.lua	(revision 2090)
+++ share/jive/slim/ArtworkCache.lua	(working copy)
@@ -20,7 +20,7 @@
 
 
 -- Limit artwork cache to 15 Mbytes
-local ARTWORK_LIMIT = 15 * 1024 * 1024
+local ARTWORK_LIMIT = 1 * 1024 * 1024
 
 
 function __init(self)
@@ -118,6 +118,9 @@
 		self.lru = entry.prev
 
 		self.total = self.total - entry.value:getBytes()
+
+		entry.prev = nil
+		entry.next = nil
 	end
 
 	if log:isDebug() then