The vitamin B1 and B6 (Thiamine, Pyridoxine) percent RDA fields freeze when you try to enter data for a new food. To reproduce:
Create a new food, and enter some values for a serving.
Try to enter vitamin values for vitamin B1 or B6 percentages of RDA.
The fields allow entry of a value, but will not let you leave focus for that field, enter any new values in other fields, or save the changes.
Workaround: Enter the values in mg and save them that way.