B3D - the only info in the forums I managed to find to do with problems with Tablet PC's was something to do with OpenGL...?
No. It's a long standing (aka. forever) issue with Blitz3D and TabletPC Editions of Windows. To fix it, you need to right-click on Blitz3D (and any Blitz3D applications) and select "Disable Advanced Text Services for this application" and the Compatibility tab. If memory serves.