I'm using VC++ 6.0 under Windows XP.

I'm coding the functionalities of a very basic POP3 client. I have all the job made by a "POP3" class which cares about the network connection, the parsing of the server's responses and the storage of messages.

Everything seems to be working fine, except the destructor: whenever I try to free the memory allocated for the arrays of chars containing the messages, a debug window with three buttons pops up. It's the old "continue, abort, debug" window, except that it's blank: no text on it.

I have checked everywhere else in my code to make sure no variable still points to that memory area, and I've followed a step by step debug to see what's wrong, but I wasn't able to understand what is the problem with those delete's.

For every delete, the debug console reports something like: "memory check error at 0x00348514 = 0x00, should be 0xFD" which makes little sense to me: why does the debugger check memory values while I am deallocating memory? What is it looking for, exactly?

Also, this problem occurs only with debug builds: release builds report no errors of sort, and the program terminates gracefully.

If anybody has a clue about what goes on exactly, I'd appreciate that.

I haven't posted source code here because the destructors contains just loops of delete's, but it's no big secret, I even thought to make it available online as public domain once polished, so feel free to ask if you think it's useful.

Thanks in advance.