I have the same problem but with the letter "a" on an azerty keyboard (which takes the position of the q on qwerty keyboards), only with the small character, not the capital letter A. For a second, I thought the A button on my keyboard was broke, but then noticed it worked fine in all other applications. So whenever I'm editing text in Quark, I have to copy/paste the a character from somewhere else in the document and paste it each time I want to use it. This is a very strange (and annoying!) method but it works.