Logged in earlier in the morning, before 10:00 (and appearance of Impresario). Collected daily rewards, poked around character crafting motif and mount availability, to verify what was in my possession, preparatory to October crown store availability, positioned a character in Auridon at the Impresario tent complex, etc. All was well.

Logged in at 10:00, moments before the appearance of Impresario. Impressario materialized. Purchased last of the berries required to summon the Onyx Indrik. Began the summoning process. A matter of 2-3 seconds into the summoning process, the game client crashed.

Restarted the game client, reached character selection screen, attempted to enter the game world. The game client crashed during the load process.

Restarted the game client, reached character selection screen. Disabled all addons on my selected character. Attempted to enter the game world. Succeeded... but after about 12-15 seconds, the game client crashed.

The game client appears to be completely dysfunctional. Seems too much of a coincidence relative to the Onyx Indrik.