No it has nothing to do with the new login process.
Here's the story:
A few weeks ago, iStock has informed all 3rd party developers that new Upload servers must be used and that the old ones would be deactivated on October 7th (later postponed to October 14th).
That's why a new version of DeepMeta was released on October 5th, which already uses the new upload servers.
Apparently, iStock did the switchover as planned on October 14th, but it seems to me that they switched off the new servers instead of the old ones. Well, or something more complicated, probably
I'll report to iStock, and will do some tests to see if my theory is correct, if so, there may be something I can do ...
Thanks all for reporting!