I have reinstalled my 4.5 on my Sprint 8330 and still the shift+Trackball highlight feature not working. So for now another Pinstacker suggested that going to the menu and click on "Select" which then lets you highlight just as Shift+Trackball. So for now its good.

JasonHDD yes I did install Docs to Go when I installed 4.5 which is great to have because at my work I get lots of Word Docs and now I can save them and edit them to send back.