DHTMLX Spreadsheet wont accept keyboard input for letter "Q"

I have the strangest problem. I’m testing the DHTMLX spreadsheet and have it working on a LAMP web server. I can enter data in the spreadsheet, and it saves it to the MySQL database. But for some strange reason I can’t use the letter “q” no matter how hard I try. At first I thought my keyboard was broken, but I can enter a q into notepad just fine. I can copy and paste the letter q into the spreadsheet, I just can’t type it into the field!