Using Older Versions
If you have a license to some of the older 5.x and early 6.x versions
of Virtual DJ Studio, you may notice some odd lines drawing on the
screen.
This is due to the fact that the older versions were NOT designed for
mutliple CPU cores. There is, however, a trick to make it run more
correctly by forcing it to use only a single CPU core,
though note that performance may suffer.
After you launch Virtual DJ Studio, open the Task Manager, and click
"Advanced":

Once there, click the
Details Tab, and scroll down until you
see
VDJ.EXE:

Right-Click on
VDJ.EXE, then click on "Set Affinity":

Unselect all CPU boxes except for
CPU 0. How many CPUs show up
depends on how many "Cores" you have, as well as whether or not
your PC has
HyperThreading:

Once this is done, you should no longer see those artifacts.
Time to Upgrade?
If you are here, you most likely are NOT getting the most out of your
Virtual DJ Studio experience; it's perhaps time to upgrade to the
newest, extremely stable 8.x series! You can download a Free Trial
without affecting your current install to see if it's right
for you:
Visit Download Page