1.0 thread is locked, so I have posted my message here.
In version 1.0, if you set several ICS URLs, only events from the last synchronized calendar is being shown. The others are not diplayed. I have “debugged” to know : I have added one URL, events are shown. If I add a second one, only events from it are shown. If I add a third, then only its events are shown (events from first and second URL ar not displayed).
Going back to 0.9.9 solved it.