Low yellow

[fishcad]

A few months ago I purchased a Pro 100 printer and have printed a variety of 4x6 photos and a couple letter size documents with color.  The ink levels on all but one of the tanks show about half full (which I hope is not the normal usage rate).  The yellow is very low and the exlamation point alert shows.  I don't think anything I printed was heavily yellow.  Is it normal for yellow to be used so quickly?  Could there be another problem?

BTW: I was away for two months so the printer was not used.  The alert came up the first time I used it when I got home.

[jrhoffman75]

Inks are used at different rates. I don't think there is anything wrong.

[fishcad]

The ink level indicator now show the yellow ink is empty.  Attached is a photo of the ink cartridge.  
Is this what constitutes empty?  The ink levels for the other colors show a little more than half full and the ink levels in the ink side (not sponge side) are about 3/4 full.

[jrhoffman75]

That's not an almost empty cartridge. Is the top peel off fully removed so the vent us uncovered?

[fishcad]

The part that tears off when you open the cartridge is completely gone.  These places look like the vents and appear to be uncovered.

[jrhoffman75]

that's it. Give Canon a call at 1-800-OK-CANON and see if they have an explanation. Could be a defective chip. I've never had it happen with my Pro-100.