I just noticed that the inventory observers fixes that went into v1.32.0.10 cause a minor but annoying (old) bug to creep up: the full "new inventory" observer (items creation/addition observer, that was largely broken and is now fully functional) gets triggered while the initial inventory is loading (being cached), that is, when the inventory cache file is empty or cleared, or very old, you will see (*) preview floaters popping up while the inventory cache loads after login...
Thankfully, the throttle algorithm kicks in to limit the number of preview floaters (you will see a dozen opening every 10s until your inventory is fully loaded). Still, this is annoying.
The workaround, for now, is to use the "Close all windows" feature (CTRL SHIFT W) whenever you login with an empty or deprecated inventory cache and see those floaters popping up...
Alternatively, if you build the viewer yourself from sources, you may apply this patch, which will be part of next release:
(*) When when the "Automatically open/view after accepting" box is checked in the "Preferences" floater, "Notifications" tab.