Cloudflare just spins the blue circle and doesnt let me access

Nexus mods and other sites, whenever I run into Cloudflare I know because it just spins the blue circle. I have followed all the fault trees I can find and nothing seems to work. Currently it seems if they use your system I cannot access site. I no ad blockers, and Avast security. I contacted the sites and they shake there heads and say ask you.