Hortus has an update for the players currently running the gauntlet of World of Warcraft's test realms for patch 2.4.2.

The Blizzard blue-poster is sending out a request for the realm's players to try to focus-test a macro bug that should have been fixed with the implementation of patch 2.4.2. As Hortus further explained:

Using a macro with several instant cast spells can break targeting and the Escape key.

This is most often reported as happening with hunter kill command macros.

We remind the readers that this request is just for the guys in the PTR. Those who've been affected by this bug will want to post the results of their test over at Hortus' original post.

Those reporting the bug will also want to post the exact macros they were using when their interface locked up. Hortus' macro focus testing thread is available for reading via the source link below.