The most common problem is people swap the LM317 to the LM337 and solder it to the wrong location.
The PCB is labled on which regulator goes to which spot.
The resistor isn't a problem.
When I place the red lead from my voltmeter on any of the 8 output pads and the black lead on the ground wire coming from the wall (no ground physically connected to the PSU), the voltmeter reads about 65v. Turning the 5K trimpot while measuring does not seem to change anything.
Coming from the wall? Please check that you follow the wiring diagram in the instructions for the Power Transformer Kit and PSU-1848 kit.
The GND wire from the wall outlet just goes to the 3rd prong on the IEC connector. The GND wire on the PCB goes to the center tap of the transformer secondary.
Please check your wiring.
For measuring voltages, put the black test leads on GND pad (labled on the PCB) and the red leads to the +48, +18 and -18 pads.
If you're getting +65Volts on all of them, sounds like a short.