Yep it's true.
PK_Tether 0.6.4 (latest) doesn't work with the K-X anymore after the 1.03 firmware upgrade. Going back to firmware 1.02 doesn't remedy the problem. However, using an
older version of PK_Tether (0.4.5) still works with the K-X after the upgrade.
A benefit of using the latest PK_Tether (0.6.4) is to have access to the DEBUG mode, but unfortunately that's been disabled, in fact, the launching PK_Tether causes an error.
Had a bunch of AF lens that were helped from some FF/BF fine tuning and now that's not possible.
(Really angry gal)