[kronolith] Problem with Holidays - settings does not stick

[Per olof Ljungmark]

Horde 5.2.2
Kronolith 4.2.3
postgres db

$conf['holidays']['enable'] = true;

For some users, the Holidays tickboxes does not stick betweens logins
and I am unable to figure out why.

One way to get around it would be to preconfigure holidays in prefs but
I can't figure out that one either.

Suggestions?

Thanks,

//per