I have tried this with multiple photos, selected pixels, made an empty layer, flattened image, etc. and it still strokes just the bottom and right side of an image. Toshiba Thrive.
Trying to repro but cannot seem to do so (have tried a layer and selected pixels); stroke command works as expected. (This is on a Motorola Xoom Wi-Fi tablet; Android version 4.0.4.)
Are you using the latest version of PS Touch (version 1.2)?
I've only just downloaded this from the apple app store and am suffering the same symptoms, strokes only work along the bottom and right hand edges. Any ideas welcoming.
I was able to repro. Kind of odd though as the only time it happens is when I use the "select all" command; never happens with a painted selection or a (limited) selection made on a layer.