Here is what I found out... not saying this is your solution but this is
what worked for me.I don't think it's a READER issue as Reader is just
the vehicle... I think it's an issue with the creation & distribution of
the form.I have been creating Fillable forms for years using LiveCycle
(presently running ES4 & Acrobat DC) and not that long ago all my forms
started failing so naturally I took to the internet to figure it out
(LiveCylce requires Acrobat to distill/create the forms correctly)There...