On upgrade 1.1 -> 1.1.1 Confluence freezes on some time.

After upgrade from 1.1 to 1.1.1, Confluence start to work, and frozen after 10 minutes without any response.
After 10 minutes more it starts to work again and I found following exceptions in Tomcat's log (I can give full exceptions if you need):

NOTE: I found that it recreated indexes, but why without my request and without any response ??

Jun 18, 2004 3:46:45 PM com.opensymphony.webwork.dispatcher.VelocityResult doExecute
SEVERE: Unable to render Velocity Template, '/admin/macros/macrolibraries.vm'
java.util.EmptyStackException
at java.util.Stack.peek(Stack.java:79)
at java.util.Stack.pop(Stack.java:61)
at com.atlassian.confluence.setup.velocity.ApplyDecoratorDirective$DirectiveStack.pop(ApplyDecoratorDirective.java:205)
at com.atlassian.confluence.setup.velocity.ApplyDecoratorDirective.render(ApplyDecoratorDirective.java:184)
at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:153)
at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:271)
at org.apache.velocity.Template.merge(Template.java:296)
at com.opensymphony.webwork.dispatcher.VelocityResult.doExecute(VelocityResult.java:94)
at bucket.util.profiling.ProfiledVelocityResult.doExecute(ProfiledVelocityResult.java:18)
....

Jun 18, 2004 3:46:45 PM com.opensymphony.webwork.dispatcher.ServletDispatcher serviceAction
SEVERE: Could not execute action
java.util.EmptyStackException
at java.util.Stack.peek(Stack.java:79)
at java.util.Stack.pop(Stack.java:61)
at com.atlassian.confluence.setup.velocity.ApplyDecoratorDirective$DirectiveStack.pop(ApplyDecoratorDirective.java:205)
at com.atlassian.confluence.setup.velocity.ApplyDecoratorDirective.render(ApplyDecoratorDirective.java:184)
at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:153)
at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:271)
at org.apache.velocity.Template.merge(Template.java:296)
at com.opensymphony.webwork.dispatcher.VelocityResult.doExecute(VelocityResult.java:94)
at bucket.util.profiling.ProfiledVelocityResult.doExecute(ProfiledVelocityResult.java:18)
at com.opensymphony.webwork.dispatcher.WebWorkResultSupport.execute(WebWorkResultSupport.java:115)
....