Hi, I have a question about ceiling cracks that I've noticed recently. We live in a 1970 ranch house with a crawlspace. Since we've lived here (11 years) there have been two long cracks that haven't changed at all in size (and look to have been patched by previous owners). Those seem stable. What I noticed in the last few weeks are small straight ceiling cracks in a few different rooms. They start at the edge of the corner of a wall, and appear to be just along possibly a tape line. It's possible they've been there a long time and we hadn't noticed, because we haven't painted those ceilings for years. Previous owners scraped popcorn ceilings and we've repainted them years ago when we bought the house. I'm wondering if these are something to be concerned about or if it could have something to do with paint? Thanks!