OpenCV 3.4.1 breaks data capture (Bug #543)

Can you explain what happens exactly?

Compilation works fine, but when trying to recognize scans (Automatic mode), auto-multiple-choice throws this multiple times:

OpenCV(3.4.1) Error: Assertion failed ((flags & FIXED_TYPE) != 0) in type, file /build/opencv/src/opencv-3.4.1/modules/core/src/matrix_wrap.cpp, line 807
terminate called after throwing an instance of 'cv::Exception'
what(): OpenCV(3.4.1) /build/opencv/src/opencv-3.4.1/modules/core/src/matrix_wrap.cpp:807: error: (-215) (flags & FIXED_TYPE) != 0 in function type

This results in nothing being actually recognized properly.

Thanks. Can you try an automatic data capture in debugging mode (from the menu Help), and post the resulting log file?

Hi,
I had the exact same issue on macOS when OpenCV 3.4.1 was released. Fortunately, we fixed:https://bitbucket.org/auto-multiple-choice/auto-multiple-choice/pull-requests/53 it very recently!
Until packagers like pacman catch up, I propose to download:https://bitbucket.org/auto-multiple-choice/auto-multiple-choice/downloads/ the dist tarball 1.3.0.2199 and

make
sudo make install

Sorry, I didn't see 'even for the latest hg'.
On what 'hg' revision do you refer to?

Looks like this was the bug you fixed indeed.
I can confirm that auto-multiple-choice_1.3.0-2208-493a811c6b40_dist.tar.gz works fine.