Error

I just tried to open my map and it won't open saying
"-Level Info data missing or invalid"
What do I do?

uh-huh......right.
no, we will not tell you how to unprotect someone ELSES map, as trying to open a protected map is the only way you get this error message.

cypher-7, the only way I know to save your map once an aspect of it is corrupted is go to your backup copy, or an earlier version of the map, or one that you loaded on a friend's computer.

Thank god I had a back up although a few hours of work have been lost but thanks.

I've got that a few times working on my map... on MY map. Its normal sometimes, your file goes corrupt.