Batch deskew wrong

[KendyfortheState]

I'm trying my first book with Scan Tailor... it's a very impressive program, very well done!
I've cut the binding of a book and used a page-fed scanner to scan in all 240 pages at 400dpi grayscale. The problem I'm having is that when I use the deskew batch process it will do the first 40 pages or so very accurately, then it will deskew the majority (90%) of the rest of the document at .62 degrees. Not every page, but most of them. If I go to a page that is obviously wrong, (always at .62 degrees) then click "Manual", then "Auto" it will correct the page, deskewing it quite accurately. Am I missing something here? It's not a big deal for one book to go through all 240 pages and fix them, but I have lots more books I'd like to do and it would be nice if the deskewing worked better.

[daniel_reetz]

Will you please post one sample page that exhibits this error?

[Tulon]

Could it be you applied a certain deskew angle to all pages? I am not sure if you can mass-apply the automatic mode to fix this problem - that particular piece of code wasn't written by me.

[kitashi]

I've checked with my project files and confirmed that the problem sometimes occurs, but I'm not sure the condition to represent yet. Anyway, I'll check the code and see if I can fix it. Please wait.

FYI, In case mass-applying automatic mode won't correctly reset angles, the easiest way to reset deskew angle/mode is:
1. Go to 'Fix Orientation' stage and rotate all pages to directions different from present, e.g. upside down.
2. Go to 'Deskew' stage and batch-process all the pages, to reset the angles.
3. Go back to 'Fix Orientation' stage and rotate all the pages to correct directions.