What was the last thing you did, exactly? What were you trying to do?
When modifying anything it should always be done one step at a time, one line at a time. Save. View. Catastrophic failure? Undo. Save. Problem averted. If you don't know what caused the problem down to the wire, you're making modifications in sweeps that are too large. Undo things as you did them, in order, until it's working. That's the best general troubleshooting advice I can give, other than to keep backups!
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