why are my buttons huge?

My colleague (Ian) is having an issue with his user interface and I cannot for the life of me figure out what it is. Ian screenshots are below (white) before my screenshots (black). As you can see we have virtually the same settings here, and I have made him try matching mine perfectly to no avail. All of Ian's buttons and text are huge. I thought maybe a resolution issue but this is the only program on his computer that does this. Is there something I'm overlooking?

SolidworksGeneral