I loaded about 200 images and told Catablog to rescan the originals folder. Everything worked well. I deleted a few through the interface.
Then I saw that several needed to rotate, so since it's a local test site I did this in the originals folder and told Catablog to Regenerate All Images. It took awhile (I now have 193 images). As it went, it printed this error 8 times: SyntaxError: malformed hexadecimal character escape sequence.
But after it was done, the thumbnails look the same(needing rotation). Clicking to see the big version, it shows correctly. Did it not redo the thumbnails?
By the way, I did rotate more than 8 of them, but I just realized I deleted 8 from the local folder as I was working on them.