Under the "Crafting Combinator recipes" tab there is only a small sampling of the recipes available in my other tabs. I am in sandbox mode and forced all tech etc. Started a fresh sandbox and confirmed same results.

No errors being reported

Correction, was able to get an error to occur by setting a "Crafting Combinator recipe" signal and a normal signal on same constant combinator. Then I removed the "Crafting Combinator recipe" signal and resulted in:

The mod Crafting Combinator (0.16.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event crafting_combinator::on_tick (ID 0)
Unknown virtual-signal name: compress-iron-ore
stack traceback:
[C]: in function 'newindex'
__crafting_combinator/script/rc.lua:173: in function 'find_recipe'
crafting_combinator/script/rc.lua:123: in function 'update'
crafting_combinator/control.lua:107: in function 'run_update'
crafting_combinator/control.lua:118: in function <crafting_combinator/control.lua:109>