Thanks for all the suggestions. However, I figured out the solution (at least as far as the Emvoice vocal VST is concerned). Within the Emvoice GUI, there is a small button at the top right of the screen that looks like a small computer keyboard. if you hover your mouse over it, it says "give all keystrokes to plugin". This functions as a toggle so you can either enable or disable the feature. I can only guess that I inadvertently must have disabled it at some point. Enabling this solved my problem, and lyrics are now correctly entered into the plugin and do not trigger Cakewalk keyboard shortcuts.