We have a custom date/time field called "Implementation Date" and we have a filter with the following definition:
"Implementation Date" is EMPTY OR "Implementation Date" < startofday() ORDER BY Updated DESC
Until the upgrade to 7.6.1 this was working fine, but now it includes results with Implementation Dates in the future. I also tried with a hard coded date. This variation does not work either:
("Implementation Date" is EMPTY OR "Implementation Date" < "2018-02-05") ORDER BY Updated DESC
Interestingly if I remove the part that includes EMPTY implementation dates, it correctly excludes future "Implementation Dates".