Got this error after submitting my timeline:
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Notice: Only variable references should be returned by reference in /mnt/gs02/herd03/28528/domains/memescheme.net/html/ocs/classes/schedConf/SchedConfSettingsDAO.inc.php on line 61 (this is repeated about a dozen times, so i guess every menu option calls this function)

Warning: Cannot modify header information - headers already sent by (output started at /mnt/gs02/herd03/28528/domains/memescheme.net/html/ocs/classes/schedConf/SchedConfSettingsDAO.inc.php:61) in /mnt/gs02/herd03/28528/domains/memescheme.net/html/ocs/classes/core/Request.inc.php on line 41
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Note that I got this error both when i used random dates (i.e. ones that wold probably clash) and when i used dates that could be legitimate.  However, like some other bugs, when I go back to the page, I found that my values have been set, so it seems to work..  It just doesn't inform me immediately that it does.