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I just downloaded the latest Extcal version from Sourceforge, installed this version on my test system and tried to add a new event. It again failed. Both with php 5.6 and 7.0.
Using the admin, the "Couldn't create event" message appears; using the frontside of my site, there is a message that the event is added succesfully, but in fact it is not added to the database.
SMEDrieben