Thanks Kovid, I got it working. When I downloaded it again, I also tried changing its location, and that seemed to be important.
On this machine I had it in a folder called "Calibre ƒ" and the final " ƒ" (for "ƒolder," get it?) seems to have been the problem. Moving calibre to a different location, and removing the " ƒ" each resulted in a healthy UI.
Moral: Avoid ƒunky ƒolder names...
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