A track-switching problem caused headaches for commuters on Muni Wednesday morning, with trains slowed to a crawl, bus shuttles trying to fill in gaps, and lots of San Franciscans late for work.

The problem occurred between Church Street and Van Ness, and because of the problem, all N and J trains entering the underground tunnel were being forced to turn back at Church and Duboce, while other trains (KT, L, and M) were proceeding normally — if slowly — through the tunnel.

As the Chronicle reports, the same problem with track-switching had been reported earlier Wednesday morning and was supposedly fixed. But then it was not.

Commuters, naturally, are pissed, and matters were made worse by conductors apparently not communicating what was going on as trains sat idle for extended periods. Sound familiar?

Per the Chronicle, "It was unclear how long the problems would persist."