So far, it does appear that Windows 10 is the culprit. I have all updates so there's no issue there. I have two screens and noticed that when I try Modular V 3 with Ableton Live 10 Intro, the Modular V 3 background image takes up both screens in size. Disabling one screen and the background image takes up only 1 screen. Tried reducing the resolution of my display - Nothing. Tried using version 3.2.1.1217 of Modular V and the background image is displayed with some patch cords but the plugs are off-center as well as the dials and no sound available. I got AL3 latest version to finally work (3.3.2.0.1509) but, B#1, B1, C2, C#2 and C5 don't work (I have the Keylab Essential 49 but when going one octave up, C5 and above don't work - CRAZY)
Booted up windows 7 (Same machine, one SSD for XP, one for Windows 7 and one SSD for Windows 10 so bootup is fast enough for me to switch often if needed)
Tried AL3, versions 3.3.2.0.1509 and the previous version - No problems at all
Tried Modular V 3.3.0.1391 and 3.2.1.1217 - No problems at all.
TADA!!!! Windows 10 has a problem with driver handling. My display card is a Sapphire AMD HD6670 with 1Gig memory and in Windows 10, I tried downloading a previous driver as well as the one that Microsoft makes available as a default. Nothing. Therefore, the core Windows 10 driver handling causes a problem between the sound card and/or USB port (for Keylab Essential) and/or the DIsplay card. (Explains why only background images are displayed full screen and the software can't plug in the dials/patch cords etc. An interrupt is probably hanging up and the software can't continue since it didn't receive a go ahead)
My next step will be to change my display card to see if anything changes. As soon as I get some money.