I just now succeeded in posting this one (click here)
I typed one sentence at a time, then hit “Preview” button. It was ok.
When I reached the sentence (2) Radiation P a t t e r n, (without spaces)and hit “Preview” button, Forbidden appeared. I removed (2), no success, removed Radiation, no success, removed P a t t e r n (without spaces), and bingo! Forbidden disappeared. I changed Radiation Pa t t e r n to Radiation Curve, and was able to post successfully.
Note: In this post, I had to add spaces in “P a t t e r n” as without spaces, this post was “Forbidden”.
Do not use the word P A T T E R N in your posts. it is taken as if it is searching for patterns and is considered attack.
If it is necessary to use it, insert spaces between its alphabets.
There will be some more words & phrases which are causing “Forbidden”. Hope these will be discovered by others and posted for benefit of all.