#20 Cannot select column in alignment (MAC OS X)

[Gerard Manning]

After loading a .aln alignment, I can no longer select a column by clicking above the row of boxes at the top of the alignment. I can select an individual residue and extend it to the entire column, but I cannot then shift-click select a set of columns for deletion.

I've used this feature scores of times in previous versions (up to a few months ago), so this seems to have crept into a recent release (I'm running 1.0.250 on an Intel Mac, 10.4.8 OS).