Because 'sketcher' is using firefox api's some things that are presumable to exist just are not possible or reliable. So here is a list of downgrades we were questioned to make, in order to get out the best of 'sketcher':

No support for web-pages that contain framesets:
This option was taken because sketches are displayed knowing the position of the main page - in the frameset case - the page that holds the frames url. This meens that if scroll down one of the frames 'sketcher' will not be able to know you did that... resulting on one 'fixed' 'sketch'

Problems with flash and other activeX controls:
Most of the times the 'sketch' will be drawn underneath the flash object.

The Web-page is completly diferent after saving it offline...
Because we use the 'save webpage' firefox api we cannot control that feature. If you saved it yourself the same thing would occur. sorry.

If you notice any more problems or want to come up with ideas for future 'sketcher' releases please e-mail us at sofiaoliveira@atmosferas.net