Brian,
     I followed those steps. When I restart labkey, I get:

java.lang.NullPointerException
       at java.io.File.<init>(File.java:222)
       at org.apache.log4j.RollingFileAppender.rollOver(RollingFileAppender.java:157)
       at org.labkey.api.module.ModuleLoader.rollErrorLogFile(ModuleLoader.java:332)
       at org.labkey.api.module.ModuleLoader.doInit(ModuleLoader.java:195)
       at org.labkey.api.module.ModuleLoader.init(ModuleLoader.java:171)
       at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:221)
       at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:302)
       at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:78)
       at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3666)
       at org.apache.catalina.core.StandardContext.start(StandardContext.java:4258)
       at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)
       at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)
       at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)
       at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:634)
       at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:561)
       at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:496)
       at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1203)
       at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:319)
       at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
       at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022)
       at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
       at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
       at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
       at org.apache.catalina.core.StandardService.start(StandardService.java:448)
       at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
       at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
       at java.lang.reflect.Method.invoke(Method.java:597)
       at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
       at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)