When I click on the terminal for the the terminal opens, all of the text shows up, but I cannot click on any of the buyable items. I can put my own stuff into the terminal, but when my mouse goes over the buying side, nothing happens. I can't click and there is no mouseover highlight.

Has this happened to anyone else?

How do I fix it?

On mine, there's some misalignment. Try mousing over the extreme far right- the price numbers for the upgrades- and see what happens.

(I also get a similar effect with the Companion Wheel, the wedges are aligned so the midpoint of the visible wedge for any one is the split- above the center is the next one up.)

When you bring up the barter window power down the terminal by clicking the "power" button. The barter window will function correctly then.

Ha! I never tried that. All this time I just guessed my way through it. xD