I don't recall what it says but if you try posting twice too soon on the same post it often won't allow it -- Go in and just slighty change the subject of the posting name (in the yellow box) -- Like I just changed the little t to a big T in the word alerT above. It should allow you to post then.

If it's different problem, I can only guess... Maybe there's a naughty word in something you wrote???

Illegal string means that you strung together the letters to a "dirty word"...something that is not allowed on the GW forums.
Linda C