Ubuntu 14.04 64 bit Valentina v0.5.0.1101a build revision 8046c790d69c
The 'Zoom Best Fit' button causes Valentina to close. It happens with any pattern, but I can't cause it to reproduce at will. It seems to happen only after many changes have been made in a given session. If a crash occurs with 'Zoom Best Fit', and the same file is reopened, 'Zoom Best Fit' will work.