Is it really safe and stable!? I´ve done the upgrade the day it was available and was a success...(!?) but, the site was becoming everyday more slow and is starting to give errors. Couple of modules are not working as they should...

 The PAGES/TREE module is not showing the correct list of newly created pages with 5.3.1 version, the main page is listed in the tree but the subpages are not... and more, now when i create a new page or a subpage that is not in the MAIN menu, they are listed in DNNlinks.

The PURGE.CACHE and PURGE.MODULE.CACHE is giving errors and causes the site to run slow eventualy to crash... this is an example of the module error from the event.viewer...

<LogEntries>
  <log LogGUID="bc5645ff-48e9-490e-b29d-1d002277baad" LogFileID="" LogTypeKey="SCHEDULER_EVENT_FAILURE" LogUserID="-1" LogUserName="" LogPortalID="-1" LogPortalName="" LogCreateDate="4/14/2010 7:03:30 PM" LogCreateDateNum="0" BypassBuffering="False" LogServerName="EWEB702" LogConfigID="11">
    <LogProperties>
      <LogProperty>
        <PropertyName>THREAD ID</PropertyName>
        <PropertyValue>7</PropertyValue>
      </LogProperty>
      <LogProperty>
        <PropertyName>TYPE</PropertyName>
        <PropertyValue>DotNetNuke.Services.ModuleCache.PurgeModuleCache</PropertyValue>
      </LogProperty>
      <LogProperty>
        <PropertyName>EXCEPTION</PropertyName>
        <PropertyValue>Access to the path '\Cache\Modules\' is denied.</PropertyValue>
      </LogProperty>
      <LogProperty>
        <PropertyName>RESCHEDULED FOR</PropertyName>
        <PropertyValue>4/14/2010 7:04:00 PM</PropertyValue>
      </LogProperty>
      <LogProperty>
        <PropertyName>SOURCE</PropertyName>
        <PropertyValue>STARTED_FROM_TIMER</PropertyValue>
      </LogProperty>
      <LogProperty>
        <PropertyName>ACTIVE THREADS</PropertyName>
        <PropertyValue>1</PropertyValue>
      </LogProperty>
      <LogProperty>
        <PropertyName>FREE THREADS</PropertyName>
        <PropertyValue>0</PropertyValue>
      </LogProperty>
      <LogProperty>
        <PropertyName>READER TIMEOUTS</PropertyName>
        <PropertyValue>0</PropertyValue>
      </LogProperty>
      <LogProperty>
        <PropertyName>WRITER TIMEOUTS</PropertyName>
        <PropertyValue>0</PropertyValue>
      </LogProperty>
      <LogProperty>
        <PropertyName>IN PROGRESS</PropertyName>
        <PropertyValue>1</PropertyValue>
      </LogProperty>
      <LogProperty>
        <PropertyName>IN QUEUE</PropertyName>
        <PropertyValue>5</PropertyValue>
      </LogProperty>
    </LogProperties>
  </log>
</LogEntries>

As a result i´ve stoped those modules and folowed the indications of Mithcel Sellers for optimizing the performance of the site, but still, i was wondering if all those errors are normal since i´ve noticed them only in the 5.2.3 and 5.3.1 version.

Thank You!