Thank you for the response and the links however they did not help resolve my issue. These are my questions:
1. What exactly do these messages mean?
2. Why did these icons show up only recently? I have been using Lightroom for years.
3. What data will I lose, regardless of the option I choose?
4. This is affecting nearly every photo in my library. Is there a way to fix this without going through the library 1 by 1?