I use Handy Switcher v.3.0.0.58 during a few days on Glofiish M700 with WM6 (Russian). And I have found some bugs.
1) A hardware button is binded to "HandySwitcher [OK-Close]" on my device. In several pressing of this button (hardware button - not by stylus) the OK/Close image in top-right corner becomes corrupt (see attachments).
2) When that hardware button (OK-Close) pressed, the taskbar redraws itself twice and then certain action executes.
3) When I use D-pad inside any app it takes about 1 second delay before close button pressing to take effect. Otherwise there is no reaction.