After playing 1.8-pre1 on a map, changing to a earlier version and trying to load any map causes a crash. (Tested 1.7.2, 1.7.4 and 1.7.10)
This has happened to me twice now and I had to delete all appdata to fix the problem.
Crash reports attached.
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Duplicate of MC-38527. You have your view distance set to values invalid for versions lower than 1.8. Please keep in mind that downgrading isn't supported.
Dupe of MC-38527
The render distance has been set to an invalid value that isn't supported in any of these versions. There are instructions in that post to resolve this.