I have it set to run as administrator for the client. I'm running fullscreen, and I also tried windowed mode. The game recognizes my mouse moving around on the screen, but it doesn't register when I'm clicking on something. I tried looking in my mouse and trackpad settings (I'm on a gaming laptop and don't have an actual mouse), but didn't see anything that would help fix the problem. I'm going to try to plug in a USB mouse and see if the problem is the trackpad. Will let you know.
EDIT: Alright, so the USB mouse worked! It's definitely an issue with the client recognizing the trackpad on my laptop. I'll try to do some troubleshooting on my end. Thanks for the help!