I received the following error message when attempting to load my save file after upgrading Nixie Tubes:

Error while running the on_load: nixie-
tubes/control.lua:183: attempt to index field
'signalstrings' (a nil value)

Change that line to read like this:

if remote.interfaces.signalstrings and remote.interfaces.signalstrings.register_signal then

it'll at least load then. Or use the old version till it's fixed

here fixed one:
https://drive.google.com/file/d/0B-oQ52NQ7NNAMEd6UGtERDFob1U/view?usp=sharing

Yep, I botched my check for SignalStrings in several mods I released yesterday. An update will come this afternoon, but in the mean time you can simply install Signal Strings and it'll all work!

fixed in 14.12