Dear Magnolians

I've just "upgraded" an EE site from 4.5.7 to 4.5.8. Besides a couple of 
dependencies that were off (STK, ETK, form, migration...) I now see tons of 
java.util.ConcurrentModificationException in the log. The log looks like this:

2013-03-27 10:34:02,487 ERROR info.magnolia.rendering.engine.RenderingFilter    
: 
java.util.ConcurrentModificationException
        at 
java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
        at java.util.AbstractList$Itr.next(AbstractList.java:343)
        at 
info.magnolia.cms.security.AccessManagerImpl.getPermissions(AccessManagerImpl.java:82)
        at 
info.magnolia.cms.security.AccessManagerImpl.isGranted(AccessManagerImpl.java:59)
        at 
info.magnolia.cms.core.DefaultACLBasedPermissions.canRead(DefaultACLBasedPermissions.java:157)
        at 
info.magnolia.cms.core.DefaultACLBasedPermissions.canRead(DefaultACLBasedPermissions.java:149)
        at 
org.apache.jackrabbit.core.security.DefaultAccessManager.canRead(DefaultAccessManager.java:265)
        at org.apache.jackrabbit.core.ItemManager.canRead(ItemManager.java:438)
        at 
org.apache.jackrabbit.core.ItemManager.createItemData(ItemManager.java:843)
        at 
org.apache.jackrabbit.core.ItemManager.getItemData(ItemManager.java:391)
        at 
org.apache.jackrabbit.core.ItemManager.itemExists(ItemManager.java:304)
        at 
org.apache.jackrabbit.core.ItemManager.itemExists(ItemManager.java:523)
        at org.apache.jackrabbit.core.NodeImpl.hasProperty(NodeImpl.java:2429)
        at 
info.magnolia.jcr.wrapper.DelegateNodeWrapper.hasProperty(DelegateNodeWrapper.java:299)
        at info.magnolia.jcr.util.PropertyUtil.getString(PropertyUtil.java:346)
        at info.magnolia.jcr.util.PropertyUtil.getString(PropertyUtil.java:336)
        at 
info.magnolia.module.resources.renderers.ResourcesTextTemplateRenderer.newModel(ResourcesTextTemplateRenderer.java:183)
        at 
info.magnolia.rendering.renderer.AbstractRenderer.render(AbstractRenderer.java:117)
        at 
info.magnolia.rendering.engine.DefaultRenderingEngine.render(DefaultRenderingEngine.java:97)
        at 
info.magnolia.rendering.engine.DefaultRenderingEngine$$EnhancerByCGLIB$$3ce1c4b6.render(<generated>)
        at 
info.magnolia.rendering.engine.RenderingFilter.render(RenderingFilter.java:173)
...

Does anyone know what might cause this?

Thanks!
-will

-- 
Context is everything: 
http://forum.magnolia-cms.com/forum/thread.html?threadId=023c863f-d6bd-492b-976f-5f4468b4b407


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