Something really weird happend , Pierre : these empty grids opening got transfered/copied (litteraly) to the next DB I opened. Opening a new DB copied new grids from the other DB !
The "Filters", "ProjectGantt" and "adressBook_" in this test DB are grids from another DB -- my own.
The "ProjectGantt"is a grid I created yesterday, and it's impossible that I got it in "there", in this other DB, with exactly the same settings (filters, etc.)
On the positive side, I got a new feature for free... Cloning/importing grids... If only I could have the control on that one. :)
I could put this one in Mantis... But can't reproduce it on demand. I only know that it's somewhat linked to the "empty grids" showing up on item deletion item deletion opens multiple grids, because these 3 grids where the "empty" ones that consistently appeared in my own DB.