Sorry, I'm unable to replicate. The gateway timeout problem usually means that a website has gone down, but from what you describe that doesn't seem to be the case, and EvC hasn't gone down that I know of in quite some time, knock on wood. Your suspicion of a security problem seems possible, but I don't know for sure. If you learn more about the problem then post again.
A search could find "yyyyyy", but not the hidden "xxxxxx". Now let's see if it can find the unhidden "xxxxxx".
Interesting. Hidden text cannot be searched. Looking up how I implemented this...
It's just a div with a "display:none". So do I process the dBCodes first before generating the list of searchable words from the message?
I think the reason is because the last word of the hidden text has no white space before the beginning of the next word, and so they get appended. But there *is* white space, in fact a whole blank line, so this shouldn't happen and is a bug. Testing this possibility now by putting white space inside the hidden section.