If Roblox Marketplace is not working or loading and you see If you are having trouble loading Marketplace message, then see this post.

If there are no reported problems concerning Roblox but for some reason you’re still getting the game pass loading error, reinstalling the Roblox can be deemed among the last options.

To reset Roblox without losing your settings, you need to Clear Roblox Registry entries, Reset Roblox App Data & Clear Roblox Cache.