Can you please send your .html code and the /views/ page. I tried calling the image from the html file as well as loading it from the /pictos folder. But no luck for me...
Don't know if this is the best way to do but this method works:
Step 1 : add you pic (mypicto.png, size = 60x60 pix, color space : RGB color) to the default Sencha Touch file (/touch/resources/themes/images/default/pictos),
Step 2 : go to you .scss file and do a "@include pictos-iconmask('mypicto');"
Step 3 : do the $compass compile
You are all set...
Please let me know what you think of this method. Tested with Sencha Touch 2.1!!!!!