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I have viewed several sites and see no issues with this feature. As long as your page variable is being typecast things should work.
Now you must upload the templates as an FYI as there where templates that changed.
Now here are the following suggestions.
1. Delete all main scripts and templates except the config files then reupload clean 5.13 files to ensure your ftp client is not per chance not allowing a file to be overwritten
2. Try turning off your vb3 header and see if the page variable works. If this is the case then you have a hack you have applied in VB
that is overwriting our variable. I have seen this on a few sites that are hacked so something to try.
Otherwise thats about all I can suggest.