IB decided that from today the name of the exchange where Stoxx is listed is EUREX and not DTB as it was until Friday. Therefore in Amibroker the symbol changed.
As a consequence:
the new contract is limited by backfill limitations imposed by IB, which prevents you from backfilling before a certain date
if you have annotations on the previous chart they are not visible on the new one.
This is similar to the issues caused by IB not allowing to export continous futures data.
I am not aware if there is any Amibroker workaround.
Brilliant! Brilliant! Brilliant! Thanks so much. Presumably this would not work for futures as there are overlapping periods when both contracts trade.