User notes Not working fully

[ProFifaLeagues]

Since upgrading to 4.0.6 we seem to have issues with user notes!
I can view all users who havent had notes added to them but when trying to view ones who have had notes saved on them it wont load and we are left with a blank page
Any ideas guys as its something ive never seen happen before!
Thanks

[Lynne]

Here is a page from the manual about troubleshooting blank or 'white' pages: http://www.vbulletin.com/docs/html/blank_pages

[ProFifaLeagues]

Thanks lynne I will have a go with the ideas there now