Update: the patch is now live for all users, including Steam users; simply boot the game or Steam to grab it.
PC fight fans may have run into a few issues upon booting up Super Street Fighter IV: Arcade Edition since its launch this week -- unexpected for Capcom's normally airtight releases. While the issues don't affect the majority of players (at least not too much), it's nonetheless good to know they're working on them.
Among the items covered: specific keyboards and devices like fight sticks not being recognized (the difference over vanilla is due to adding support for two keyboards), remapping causing crashes, and a borked 'smooth' framerate mode (use 'Fixed' for now).
The first two issues should be ironed out Monday or earlier; the latter, July 25 or earlier. Meanwhile, the offline mode limitations mentioned previously should be patched out July 16 or before.