From Bastien Chevreux on sourceforge ID: 3495903

there is a regression error in 6.7.0 which was not in 6.6.3: dragging multiple WIG files from the desktop and dropping them to IGB, this creates multiple species / multiple genomes (one for each file) although the sequence names in the WIG files are the same (and thus should be assigned to the same unknown species / genome). When loading the same files in 6.7.0 via the file interface (or drag & drop in 6.6.3), the error does not occur and everything is OK.

How to reproduce: unpack the attached ZIP with two tiny test WIGs. To see the expected state: in 6.7.0, load these WIGs via the file interface (also choose load whole genome). You should then see the two data sets displayed one above the other. Notice that both files where assigned to "Unknown species 1". To see the unexpected error state: restart 6.7.0. Then simply select BOTH files and at the same time, drag and drop the two attached WIGs into IGB. Notice that now the files are assigned to "Unknown species 1" and "Unknown species 2", making it impossible to display both data sets at the same time.