GIB doesn't claim often enough. A very small number of deals from the Deal Library contain incorrect information. Loading a set of saved deals takes longer than it should. Multiple undo's don't update trick count. GIB can sometimes be persuaded to run from doubles forever, getting doubled at higher and higher levels.
Explanations occasionally incorrect, especially after undo.
Dutch dialog box messages are sometimes truncated. Deals from first session of Wagar Womens' Teams have invalid auctions. Both Spingold semifinals have the same deals and should be merged. A few conventions are not played as requested. Autoplay from specified contract can be selected during the auction.