Just for clarity – within a php.ini file I believe that memory_limit ought to be expressed as 64M rather than just 64 (just pointing this out in case the setting is not being followed due to the missing M).
Can you double check that and then let me know if you made the correction and if it made any difference?
Do you think the conflict may exist with the recent update? Possibly that the option to automatically include sales info and map info conflicts with already posted events?