Created attachment 937623 [details] backtrace Version-Release number of selected component (if applicable): meld-3.11.3-1.fc21.noarch glib2-2.41.4-3.fc21.x86_64 Steps to Reproduce: 1. meld local base remote --output merged Actual results: Segmentation fault in g_type_check_instance_is_fundamentally_a at gtype.c:3981 see attached backtrace I'm assigning this to meld because I don't see the problem with meld-1.8, while the code seems similar. But it obviously crashes in glib2, so reassign it as you like. I'm also setting severity to high because it breaks rebase-helper, which uses meld this way: https://github.com/phracek/rebase-helper/blob/master/rebasehelper/diff_helper.py#L151
I don't see the problem anymore with up-to-date F21, closing.