Regarding the commenting issue: It seems that Instagram revoked commenting access for pretty much any app out there.

See: https://groups.google.com/forum/?fro...rs/t3Bw01jrz9A
or: https://groups.google.com/forum/?fro...rs/y3SxO3OJyz4

I've sent the whitelist request, but it seems like not many were able to get a reply yet

Sorry, stay tuned.