[MENTION=142635]pktrix[/MENTION]; On second look at the thread you made for the game, I see another problem. you used the wrong imagetwist code. It shows the imagetwist "no hotlinking" message.
I did some checking on imagetwist, and this should solve your remaining problems.
Note: These instructions are simple and detailed, only because I do not know your level of experience.
Note 2: You may want to clear your cache, first.
Go to the imagetwist upload page. On the Thumbnail Size setting, choose 500x500. That should be a good size for a forum post. Upload your image(s).
When it finishes upioading, it sends you to the links page. It offers View Links, Forum Codes, and HTML Codes. Click Forum Codes. Click COPY.
Now go to your game post on the forum. Edit. Delete the old codes there. Then paste the code directly into the post (do not use the Insert command). Save the changes.
That should take care of things, for that thread, and any new ones you make.
Here is a pic I uploaded with imagetwist.
Good luck, hope this helps!