The bug that crashes the client, when casting Gift of <insert name> has been fixed. This would be applied to current update, which should now be available on Blight Client (Blight should now offer a small update). Many new optimizations to improve frame rate and other misc improvements to overall client performance (unnecessary actions) should be noticeable for some players.
It looks like the new istaria.exe on Blight has been patched out, please try this out and re-test any issues such as the Gifts and other issues.