All you’ve said has been helpful.
We just released 1.0.9, which should address the problems you’re seeing.
If by chance you’re still seeing the errors after the update, go to the Settings tab for the Lingotek plugin, then Custom Fields tab, click on the save button.
This will clear out any strings that were somehow saved to the database. Then you shouldn’t see the errors again.
Thanks for your help. These debug messages were very helpful.