FrameScript dialog box not appearing

When I select a script from the FrameScript menu, a dialog box should appear where I can select a language to change the text inset flows in my document. This used to work on my machine, and it works on my colleague's machine, but the dialog box no longer pops up for me. But the box must be somewhere because if I press Enter, the script runs as if I selected the first option on the list.

I was on FM 10 when the problem first occurred. I've since installed FM 2017, but there's no change. The box still doesn't pop up.

Help? Thanks in advance. This has stumped both myself and our IT department.