[TYPO3-english] pageNotFound_handling and appearing of 404 error page at BE

[Victor Livakovsky]

Hi, list.

I have a problem with 404 error handler. When pageNotFound_handling is 
activated ($TYPO3_CONF_VARS['FE']['pageNotFound_handling'] = 
'/index.php?id=55';) 404 error page succesfully appears at FE, when 
non-existing page is requested.

But the problem is, that, when the page is edited at BE (f.e. page's 
subtitle) and then "Save" icon is pressed, this 404 error page appears 
at the right frame (where, actually TV page module should appear), and 
changes are saved. If no changes were made at page properties and "Save" 
icon was pressed, then apperas normal page module.
Problem appears with TV and standard page modules. Same for "Save and 
view" and "Save and close" icons.

What may be a reason of it?

Thanks in advance for any help.