I'm not sure if this has been discussed before, but I'm sure most people are aware of the glitch in Forge which slightly alters the location of objects that have been placed using coordinates. The glitch occurs after you save a map. Afterwards, you look at certain objects and discover that they are slightly off. This may not seem like a big problem when considering aesthetic and background details, but it is a big deal when dealing with surfaces that become mysteriously jagged. As far as I'm aware, this problem has been in the game since Reach. After the glitch occurs, you can try going back in and readjusting all the effected pieces, but the same thing happens after the second save. Before, at least there were precision tools to help put pieces back in place. True, sometimes it can be fixed with magnets, but if your wall or floor uses an irregular pattern that magnets don't align to, this is no help. Many of my maps were effectively ruined by this gremlin-of-a-glitch in Reach, and I am horrified that it lives on in Halo 4. For further reference, this seems to particularly effect the following pieces: Coliseum pieces Building blocks Brace large Edit: Grammar
Yes. This has been discussed before. Even I have this problem. As far as I know, this problem still has no real fix.
The reason for this is that the coordinates of each object that save when you hit 'save map' aren't as accurate as you can edit in the game. The objects shift to the closest possible coordinate which is almost never where the intended position of the block is. It happens most with these large items because when the angle of a large object shifts, it shifts a more noticeable amount because edge of the object is quite far away from its centre point (such as in the brace large). It is worse when you are forging with someone else and you are not the connection host (not dependant on game host). To minimise the shifting, forge along whenever possible and keep your lobby closed so no one joins and steals your host connection.
I'm going to lock the thread. This subject has been discussed numerous times. Here's one such thread that had a pretty good discussion on the subject. Hopefully it will be helpful for you. Click me