Comment 1 for bug 152791

OK.

I found out what the problem is.

In the file ~/.kde/share/config/kresources/calendar/stdrc, the offending line was:

ResourceKeys=N5eXaSIgR8,N5eXaSIgR8

where N5eXaSIgR8 was, of course, the key for the Standard resource.
Removing the repetition of the resource key seems to do the trick.
Restarting the reminder daemon does not result in this entry being overwritten.

If I rm the stdrc file and restart kontact, it does create two profiles, but different ones (i.e. both are not standard)

However, this should still be considered a bug since by default Kontact creates a bogus entry for ResourceKeys.