Thanks very much for your message and sorry for the troubles.
I’m the tech suppor from CME. I haven’t gotten the report from other user about this problem. If you update VX firmware under Windows XP OS and do reset your keyboard after upgrade? Please try to do the V2.3 firmware upgrade again to see if helpful.
PS: If you can use a MIDI monitor software to check the MIDI data of pitchbend wheel? Thanks.
If you like, you can send me mail to discuss your problem: [email protected]