Looks related to I get an Error on NNS page and i cant seem to find my Motoko neuron. I can only see ICP neuron
Are you able to open this link? It should show JSON data starting with [{"index":40,"canister_ids":…
Have you tried a different network? For example your mobile internet vs. home WiFi.
And can you see if there are any errors in the developer console? On Chrome the developer console can be opened with Upper Right Menu > More tools > Developer Tools.