I think I remember that changes to product royalties take hold after the 20th of each month is that right? However if I go to the back end and click edit details and change the royalty in that edit area does the price change still not take effect till after the 20th of the month or does this override that and update asap?
Any product royalties changed between 20th and the next 20th changes on or around the the next 20th of the month. Ex—May 21 changes on or about June 20th ( if the servers are behaving)
A workaround I found - if you select another product at the same time (one preferably with the royalty you want) - then edit details (top right - next to bulk actions) then change the royalty of both products - that sticks - and then it will update when the 20th comes around.