I've tried on an other PC to see if my pc was the problem.
I've tried a fresh install of Musicbee 3.2.6760. No plugin or skins. Language set to French.
2 scenarios; with and without the auto organise media files checked.
I've the "monitored folders" set up to "continuously monior", a folder named simply "Inbox" in My documents.
Put some albums in my library, and others in the inbox folder, search with the search bar in the Inbox tab, delete an album in the Music tab : same results everytime, the search bar empty itself and the search results is gone making me searching angain.
Not a big deal in a daily use. I noticed that because I have a lot of fresh lossless albums in my inbox that I have to replace with old lossy albums that are in my library, and i have to go back and forth between my library in inbox, making sure to not create dupes.