Recently migrated from 32 to 64 bit Confluence systems, and now webdav transfers are showing an exception in the logs.

Webdav plugin version is 2.4, and all the webdav modules are enabled in the plugin manager.

Here is a sample of one of the exception messages, and attached is the full text of the exception.

Please contact me if you'd like any other logs, thanks

2012-06-04 11:26:30,457 ERROR [http-8080-7] [extra.webdav.servlet.ConfluenceWebdavServlet] service Unexpected error
– url: /confluence/plugins/servlet/confluence/default/Global/PSN/Home/Projects%20and%20Activities/Hydrogen%20Release%207.0.0/Release_Schedule_-_7-0-v1.xls | userName: jack.weimer@pearson.com
org.apache.jackrabbit.webdav.DavException: Precondition Failed
at org.apache.jackrabbit.webdav.lock.SerializableLockManager.releaseLock(SerializableLockManager.java:182)
at com.atlassian.confluence.extra.webdav.resource.AbstractConfluenceResource.unlock(AbstractConfluenceResource.java:413)
at org.apache.jackrabbit.webdav.server.AbstractWebdavServlet.doUnlock(AbstractWebdavServlet.java:709)
at org.apache.jackrabbit.webdav.server.AbstractWebdavServlet.execute(AbstractWebdavServlet.java:261)
at com.atlassian.confluence.extra.webdav.servlet.ConfluenceWebdavServlet.service(ConfluenceWebdavServlet.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at com.atlassian.plugin.servlet.DelegatingPluginServlet.service(DelegatingPluginServlet.java:42)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at com.atlassian.plugin.servlet.ServletModuleContainerServlet.service(ServletModuleContainerServlet.java:52)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:46)
at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter$1.doFilter(DelegatingPluginFilter.java:66)
at com.atlassian.confluence.extra.webdav.servlet.filter.ReverseProxyCopyAndMoveDestinationFix.doFilter(ReverseProxyCopyAndMoveDestinationFix.java:59)