[TYPO3-4-3] What does "changes in fields: hidden" in the log mean?

[Thomas Sattler]

I am having some TV probs, and loking thorugh my log to find some 
clues.. (the problem I am having is, that text entered into a FCE is not 
getting saved)...


My log sometimes shows something like this:
Record 'New Trainer' (pages:170) was updated. (Online). Changes in 
fields: hidden.

What does that mean? field hidden?