Originally posted by ezekiel23:
OK, I tried to explain this in the other thread, but nobody seems to understand

so I'll try again here.
Although I can't be certain, I'm guessing this is what happens when you do web entry. When you open a web entry window, the server generates a security code for you to read and confirm. When you type the security code back into the webpage, the server checks the code it sent you against what you typed, and lets you submit if it's the same, generates an error if it's not. This works FINE if you're using one window at a time.
Trouble is, you get problems if you open more than entry form at once. If say you open three entry forms, the server gives you a new security code each time you open or reload the entry form (or press back/forward/refresh). Unfortunately, each security code overwrites the previous one. It doesn't attach an new entry code to each window - it attaches a single security code to your specific computer. What this means is that if you then go back to the first window you opened and put in the seemingly correct security code, the server will check the code it has stored for your computer - and find the security code it gave you for the third window. Obviously the two codes will not be the same (unless you're a very bad typist!) and so it rejects what is seemingly the correct code.
Therefore, to get round these problems, simply type in the security code from the LAST web entry form you submitted, and it should work. Even though you're not typing in what it tells you to

Works for me, anyway.