In my new computer i have installed windows 7 64 bit and coreldraw x6 64 bit.
but when i export pdf drop shadow changes as shown in image.
problem with pdf 1.4 and above only.
What settings are you using when export as PDF?
In all settings above 1.4 or later except pdf/x-3.
I have installed 32 bit version of Coreldraw X6. There are no problem with 32 bit version.