'this' is a pointer to the current object. You may have seen code that does something like this->DoSomething(); or this->somevariable = 42; or maybe not since the the this pointer is always assumed so it's fairly rare that you actually need to specify it in code, but it is passed to any member function automatically which is why you'll see it in a stack trace.
Those look like 64-bit pointers to me. They look odd to me too, but keep in mind that virtual address != physical address, so if the OS decides to map the address space somewhere that seems weird it doesn't mean it wouldn't still work. I don't debug a lot of 64-bit apps on Linux so I don't know what looks normal.
The lines numbers in svn don't seem to match up with the core dump, but looking at QuestParserCollection::EventPlayer nothing jumps out as horribly wrong. It appears to check for valid pointers, and it doesn't do anything particularly exciting. It could be a 64-bit only thing, but I'd guess there's at least a few other people running that so if it was a general issue there'd be some freaking out.
I'd search a bit for the global player.pl change in the forums here. I remember someone having some sort of problem, and maybe the solution is there. I think it was Stormhaven that had trouble, and maybe they needed to add that global file somewhere? *shrug*
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