April fools?

We are experiencing the issue too. I have raised a support ticket with Microsoft. My colleague and I worked out that the issue does seem to be related to daylight saving time. I am curious as to whether all of you in this thread reside in countries who have changed their time on either Mar-31 or Apr-1. We're in New Zealand so for us Daylight Saving ended at 3am on Apr-1 with our clocks going back to 2am. 

If we have dates in our PBIX file (and the same in the service), when we format them as dateTime, there is obviously not a time component, but if you format that variable as datetime it shows the time as 12:00:00 AM. That is except for on April 1st, where it shows 1:00:00 AM for the time. I believe that this is what is causing the slicers that are built on dates not to work. And likewise the cross-highlighting as Philthy explains.

I have created this very basic report to demo the issue: 

https://app.powerbi.com/view?r=eyJrIjoiYjJkODY0NjAtNGQ5Zi00NmM4LWJjOWUtODQxZGQwNGZiOGQwIiwidCI6ImRiZGJlMzY2LWU0MGYtNDRkZC1iMDQyLTBmZmEyZGYzZWI0MyIsImMiOjEwfQ%3D%3D

On page 1, there is a table and a slicer containing the same date variable. If you select nothing on the slicer, then all three dates show in the table. And if you select Mar 31 or Apr 2, the table is appropriately filtered to these dates. But if you click Apr 1 in the slicer the table shows no data. 

On page 2, I've shown the same table but this time with the date formated as datetime (remember I didn't enter those times, I only entered dates, so this is what Power BI is automatically calculating). You can see that Apr 1 has a different time to the other two dates which I am sure must be related to the cause of this problem.

I will update here when I receive action on my support ticket - if the moderators don't do so first.