PROBLEM!!! >>> FS Poster v3.5.6 Add Instagram feature not working!!!

I cannot add my Instagram accounts in FS Poster v3.5.5 or v3.5.6. I tried many times using cookie method and also the user/pass method plus I completed the challenge every time. I get the account successfully added blue notification at the bottom of the page in the FS Poster add Instagram account page but the page still says zero Instagram accounts. I refreshed paged, cleared cache & cookies and logged back in. No luck, still says zero Insagram acconts no matter how many times FS Posters says I successfully added my 3 Instagram accounts with the cookie method and user/pass method with successfully completed challenge every time. I tried adding my same 3 Instagram accounts to my "Instazood" auto posting service using their user/pass method completing the challenge also and was successfully able to add all 3 Instagram accounts every time in my Instazood auto posting service, absolutely no problem and very quick too. This means the problem is definitely FS Poster; it is not playing friendly with Instagram for some reason. Does anyone know why and how to fix this add Instagram account problem in FS Poster v3.5.6?