Wow, thank you all for the replies!
I was tired last night when I posted this. Forgot to say that, besides my Crocs, I also wear Luna sandals which, are practically paper thin now due to wear. During the days I’m not hiking, all that I wear (I’m self-employed) are these Lunas and Crocs. When I hike for conditioning, I’ve been wearing an older Altra Superior 1.5 with the insole out… and they feel cushy. In addition to those, I also wear an old pair of Carson Iguana Racers, without an insole, which don’t feel very cushy. Just got a new pair of Carsons and I’m hiking in them with the insole in. Cushy!
I’m used to wearing unpadded shoes…except for the Crocs. I used to go barefoot a lot, including hiking. Evenn backpacked twice sans shoes… though that’s been ~6 yrs ago and my feet are not nearly as tough as they were then.
I haven’t pinpointed the exact location of discomfort since it’s only now become a concern. Best I can describe is that it’s in the center of my foot, ball region, slightly forward towards my toes. When I’m hiking, it reminds me of the feeling you get before you blister, hence my description of feeling hot.