Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Instagram Deleting Accounts After ‘violation of terms’
If you have been active on either Twitter or Instagram over the last couple of hours you will have most likely seen the reports of Instagram deleting thousands of accounts due to violation of Instagram’s terms of service.
No Instagram really is deleting accounts. Already seeing it
— LaSara (@MixedDestiny) May 24, 2013
Rumours have spread on social networking sites reporting that the accounts which are being shut down are them of those who do not use the in app camera feature to take their Instagram pictures, this seems very unlikely as the app even offers a feature to import other pictures you have taken else were.
This most likely just started out as cleaning up spam and fake followers but with all these reports it seems something went wrong somewhere.
Apple Fan Site has contacted Instagram’s PR for a comment on the situation.
— King Sinclair (@Ajay_InFlight) May 24, 2013