A workaround is to backup evolution (file --> backup settings). When restarted uncheck/check birthdays and anniversaries and that should force then to appear. It's tedious but probably good practice to backup anyway.
I thought this problem was related to sharing my .evolution folder with another computer through Dropbox, but having read this and similar threads, it seems to be a longstanding bug in evolution.
A workaround is to backup evolution (file --> backup settings). When restarted uncheck/check birthdays and anniversaries and that should force then to appear. It's tedious but probably good practice to backup anyway.
I thought this problem was related to sharing my .evolution folder with another computer through Dropbox, but having read this and similar threads, it seems to be a longstanding bug in evolution.