Oh I ran into this issue myself. On your CF admin settings set the Method POST on number of items to like 500 and that will fix it.
What changes did you make? You have to modify the neo-runtume.xml by adding something like:
<var name='postSizeLimit'><number>1000.0</number></var><var name='postParametersLimit'><number>5000.0</number></var>
the numbers depending your requirements.
And make sure ColdFusion isn't running when you edit neo-runtime.xml. Otherwise it will overwrite your changes.
This is probably what was happening to us! Thanks for this☺