Problem with inserting images to post

[spetrizio]

Hi,
I am trying to start new thread with photos of my greenhouse, but I'm not able to insert image. Images are on the photobucket.

Size is not the problem I have tried small photos with the same result.

The error message is:
"Post denied. New posts are limited by number of URLs it may contain and checked if it doesn't contain forbidden words. "

The same result is if I want to insert link.

Only I can add the pictures as attachment but I would not like that.

I can not find information about limits for new posts. I am not sure what the "new post" means. first few posts? how many?

Maybe I am doing something wrong.
Any advice?