Web Direct isn't certified for tablets yet. Don't expect a lot of support.
Up to Fms 12, it works fine. Now I am afraid of ugrading to Fms 13. I have to wait till some other problems solved.
WebDirect for 13 is an entirely new way of drawing a browser screen than was used in previous FM versions. I recommend watching the FMI-released under the hood session on WebDirect to better understand the changes in how the screen is redrawn. I am pretty sure we will see WD supported on touch devices someday, but the implementation just isn't there yet.
[If you encounter this flashing screen effect in a supported device/browser, check for layout-based script triggers, some of which could really hose WebDirect's performance (i.e. onObjectModify).]
Up to Fms 12, it works fine.
Just to re-emphasize: webdirect was introduced with FM13, before that it was IWP. Those two are completely different and not comparable. If you have upgraded from 12 to 13 not taking that into account that you probably want to revert back to 12.