Nextion serial problem

Development Tools IDE 1.x
2

Works fine with esp8266 2.4.0-rc2 library but not with esp8266 2.4.0 or esp8266 2.4.1
SoftwareSerial: was updated to 3.3.0 in the esp8266 2.4.0 update.
Any ideas on what could be causing issues in this update.