The system does not show me the controller debug log of my VF page.
the VF page is viewed with site. and I added a guest user as a monitoring user.
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Have you checked your VisualForce Debug Log Level Settings? If its level is set to ERROR, then you won't be able to view what's happening until it breaks.
Short version: Go to [Your Name]> Developer Console> Click on Debug menu> Change Log Levels.
When i started working with Force.com Sites i faced this problem many a times.
The page i try to access will say there is an error occurred and when i try to check the debug logs, there won't be an invocation of any of my controller methods.
So if i check the debug logs for the user(either portal user or guest user) i will be getting debug logs which have only the getters and setters for the variables in controller.
If you notice keenly, the last getter or setter would be the last executed code and failed there itself without moving further.
So i start investigating those specific setters and getters and found the reasons.
Hope this helps.