I'm running Pro Tools Ultimate 2018.4. With the end of Windows 7 looming I decided to (once again) upgrade to windows 10. I've used this version of PT for around two years on windows 7 without issue. Therefore I know its an OS issue. But basically when I click on a clip it highlights the whole clip and in empty space will highlight a region from clip boundaries, despite the cursor being in smart mode meaning that I can make rapid edit points, also when I click to select with the grabber tool it auto generates the rename clip dialogue box. It never did this in Windows 7. It feels like PT has turned into Logic. Its reduced my work speed to a crawl. I've included a link to a video. Thanks.
https://youtu.be/v-7HqongXvM