I hope there is a simple fix and I am too freaked out about this to think through it clearly. I have D4 in manual mode with 50mm on (tried other glass and same problem) and metering looks like I have a 10 stop filter on. Everything dark, meter pegged to underexposed. Have no exp comp dialed in. Switched to App Priority and normal operation with correct metering and light. Cannot think of a setting that would have caused but obviously I have done something and not realized it. Any suggestions. Thank you.