If you try to override the the pagelayout.tpl after editing it, you'll get the following error

"
Error: 	Mar 26 2013 11:04:37

Could not open file , check read permissions
"

Steps:

1. Make a clean installation of eZ Flow
2. Enable DebugOutput, DebugRedirection and ShowUsedTemplates in override/site.ini.append.php
3. Login in eZ Flow frontpage
4. Click the "Edit" pencil right next to pagelayout.tpl file
5. In the Footer area, where you have

<!-- Footer script area: START -->
{include uri='design:page_footer_script.tpl'}
<!-- Footer script area: END -->

Change it by

<!-- Footer script area: START →
{include uri='design:page_footer_script.tpl'}
<!-- Footer script area: END -->

6. Click on "Apply changes" button
7. Choose "eng", from the Siteaccess drop down list
8. Click on "Set" button
9. Click on "New override" button
10. Choose "ezflow" from the Extensions drop down list
11. Fill in the "Filename" field with "my_override"
12. Choose "Copy of default template" bullet
13. Click on "OK" button
14. Verify the Error: in the reddirect page