This is how mine works. When you want it on, go the arrow on the right side of the spell check box, click that, a drop down menu arrives, selections are for the language or auto fix. Ive never used mine in the on position while typing, when im finished i click the little arrow, and select auto fix. It corrects everything needed, has the little red line. Then, it has a faint "stop" over the entire box, I just click it. I just now tried mine while typing, i mispelled ,and a square box came up pointing to my incorrect word, and i couldnt continue typing. There was the option on the box to stop spell check. I dont know if your settings are somehow different or what. The only time i have a red line is when i click the box to check a document for spelling when i am finished typing. I am using i.e./google toolbar. Maybe you have firefox and its different? Try to click the box to see if it will give you an option. That has to be annoying.