Cube 6.4 unable to open the text editor

Just upgrade cube into Cube 6.4
However I cannot open any .prn file due to " unable to open the text editor" error
Anyone knows how to resolve?
after clicking “OK” it has error of "Access violation at address 0040221A in module “Cube.exe”…

Please send us an email to generalsupport@citilabs.com with a screenshot of the information about the CUBE by clicking on About after clicking on “?” near the top-right corner of CUBE.

After fighting this for a while, went back to 6.1.1 (easy life) :cry:

Hi. You really dont have to. Send us an email and we may have a patch to fix the problem. Send the information as Sai requested. Thank you.