1. Most annoying: although TC is supposed to preload thumbnails in search results too, this isn't happening if the view is ALREADY in thumbnail mode.
Preloading is fine if thumbnails are activated AFTER the search is executed.
2. With the list in thumbnail mode, I execute several searches (3, 4 searches usually) and then I press PageDown repeatedly and fast. For the first searches everything is fine (except that the thumbnails aren't preloaded), but at some point (a lister plugin must be crashing) IrfanView gets involved (I see it in Process Explorer).
From now on thumbnails aren't loaded anymore and sometimes the system (or TC) displays an error dialog saying that there isn't enough memory to perform the operation, although, AFAICS there's plenty of free RAM.
Also, from the point IrfanView gets involved, the TC's button-bar and other elements of the window are misplaced and/or not drawn.
At the time of writing this, I disabled IrfanView in Thumbnails Options page but I still get the funny drawings and the thumbnails not showing at some point (maybe because IV still gets loaded

TC7b4, XPSP2