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@Velocio
Your clock is out? That is perhaps feasible.
The canary. WTF is that? It's a computer term relating to an old miner's thing. Put a canary in a birdcage and go mining, if the canary dies get the hell out fast as there's probably lots of gas and you're next.
In computing the same idea is used to validate security sessions. A canary is a piece of information that is put into each web page you visit. When you visit the next page you send back the canary and if it's still valid we give you another canary and we all go about our business safe in the knowledge that nothing is amiss.
What you are seeing is that when you get to the UserCp page, your canary isn't there... or it's old and has expired. It's the equivalent of that canary in the mine dying, and it's an indication to the server that something is amiss and to get the hell out of there... so you get your error message.
The questions that arise:
1) Are you the only person affected? Is it just that a specific link or page is missing a canary value and that affects everyone (this is my problem) or is this just something that affects you and no-one else here sees (this is your environment, so your problem).
2) Does it happen even when you just click on a link? http://www.londonfgss.com/usercp.php If so, then it's likely to be the latter of the above (your environment) and likely to relate to cookies... which yes the system clock can affect.
Basically... step through precisely what you're doing... in real detail as I cannot see your screen. And then if others can let me know whether they are also affected... we'll have it diagnosed in no time.