Running Windows 8.1 on a Lenovo Thinkpad. Been using TB and Lightning for years without problem. I liked the basic functionality of TB/Lightning. Just today, both before and after TB latest update, Lightning will not accept multi-day events. I enter a start date and time. When I enter an end date in the appropriate field, it modifies the start date to correspond with the end date. This happens whether I try to specify times or simply check the "all day event" box. I also have problems editing dates on saved multi-day events (like if I want to make the start date a day earlier and keep the end date the same, it defaults to moving the end date back a day as well, and will not let me manually re-enter the original end date). The only work around I can do is make, say, 4 separate events with the same name on 4 consecutive days for a 4 day event. This is too clumsy to use long term. Thought about uninstalling Lightning and re-downloading it, but I don't want to have to re-add all my events. Anybody else encounter this? Thanks.