Unable to open XFA forms with 64 Bit-Reader – "No error" error
With the 64 Bit version of Reader (21.011.20039) you're unable to open XFA based forms. All you get is an error message saying "no error". After clicking [OK] you only see the Shell-PDF with the "Please wait …" hint. The XFA content isn't processed. The 32 Bit version seems to be fine but automatically gets updated to 64 Bit after some time.