Ok bit of an odd one but when taking the register in SIMS on one machine in the school, it keeps inserting 'N's when saving.
This is a primary so SIMS has two sessions per class AM and PM. Yesterday this manifested by replacing both morning and afternoon sessions completely with 'N's when 'Save' was clicked after the PM session.
Today, when the AM register was taken the PM register was filled with 'N's when 'Save' was clicked.
Any ideas? :)