I don't know the answer, but I suspect those that do are going to need more information :-)
What do you mean by "does not work anymore"?
a) Code no longer compiles
b) Code compiles, but at runtime an error or exception is raised
c) No error or exception, but while an output is expected, none occurs (ie null, empty string or 0 output)
d) An output occurs, but it is wrong (ie expected 5, got 4)
e) Something completely different (and if so, please explain further :-) )
And chance you can post a small code snippet showing how you're using these functions?