[Dokins]

I'm not an expert in this field, but would it not make more sense to switch these two around?

pawn Code:

strcat(szMainString, szString);
strcat(szMainString, "~w~, "); // this is the problem line

it looks like you're trying to cat the string before it's there?
Like this..

pawn Code:

strcat(szMainString, "~w~, "); // this is the problem line
strcat(szMainString, szString);