Somewhere in last few weeks (or months?), the "Select the last item selected for posting when opening the Selling tab" option stopped working for me, i.e. when I reopen Auctionator - and even when I just switch tabs - nothing is selected in the Selling tab, even though the last item selected is still there.

It broke with this build https://www.curseforge.com/wow/addons/auctionator/files/5100004

Fixed in the latest alpha. Available from Curseforge/Wago shortly.