Are you using an anode resistor? That’s crucial. It sounds to me like something’s up with your driver IC. Can you post a schematic?
No, what size resistor?
My circuit is as described - no resistors or caps or anything. The nixie plugs into the IC and 180v+, the arduino plugs into the four IC logic pins and the IC is also linked to +5v and GND. All the grounds are linked.
The resistor depends on the specs of the Nixie in question. For instance I have some sub-miniature Russian IN-17 nixie clones that are speced for 170V and 47k series resistor. The sheet I have says they will work at lower voltages and upto 82k series resistor. The series resistor goes on the anode to avoid having resistors for every cathode (which can directly connect to the driver).
That said I haven’t tried interfacing these tubes yet, I’ve merely verified they light up.