SHOWTIME SOFTWARE - PICTURE DRIFTS

[stancordy]

Have a Vk-73A- PC to TV sender  - audio and video seem to work fine except for one glitch.
The picture drifts to the right on the TV. The source is rock solid so it doesn't appear to be at the PC end.
Tried setting position/width/height with SHOWTIME software. Fixes it for a while then it drifts again.
Is there an update to the software to fix this issue?