An Awazon address that will not load is almost never the market being gone. It is usually your Tor circuit or a temporary flood.
Build a fresh circuit
Use the Tor Browser menu to request a new circuit or a new identity, then retry. A bad guard or a congested path is the most common cause and a fresh circuit fixes it.
Switch addresses
Move to another address from the pool on the URL page. All resolve to the same market, so if one stalls another usually opens. Verify whichever you land on.
If all of them stall
If every address is unreachable across fresh circuits for several minutes, a flood window may be in progress. These pass. Wait a short while and retry rather than taking an unverified address from a stranger.