Disappearing Backdrops

[KingToast]

This has happened to me before. I do not recall how I remedied what was going on; therefore, I am asking.

In a simple 640x480 level, there is foreground, a river, and a mock background that is just for looks. For some strange reason one individual tile of the background floor disappears immediately after the fade-in effect, leaving a red house sitting halfway on land and empty space.

First, has this happened to anyone?

Second, and more importantly, how do I fix this?

[InsertNameHere]

Its kind of hard to tell what is going on if you don't have the file.

[Skeets]

Yes, this has happened. Sometimes, while scrolling, (and appearently frame trasistions too) the backdrop dissapears. This usually doesn't happen unless you paste an object into the backround though.