A lot of times when trying to save an ID number to name in FLeds, it wont work. The simple reason why is your using the wrong number.
For example, if you are trying to name a jump hole lets say. and you are using a number that starts with 197XXX, it wont save. But if you use a number that starts with ( if memory serves me correct ) 458XXX then it will.
What you need to do is find an item just like the new item you are naming and compare the ids_name number. If you are naming a new jump hole then find out what the original jump holes use for a number and use the same first three numbers.

That is one reason, another is because the dll is the one created by FLExplorer as well.. it's write protected or something like that I think. Change it's values and try again if you are using a FLE dll.

Well, I can´t save to the flempty.dll I´m using, but I cant save to the dll that is created by FLE