Previewer doesn't grok 2d

i just installed nwn on a new machine and for some reason, when i select the 2d radio button when i’m previewing item templates in the toolset, the image doesn’t change from the 3d form. sometimes it looks like the 2d image flashes for a brief microsecond or so, but then no matter whether the selector is 2d or 3d, i always get the 3d.

the machine has 2 video subsystems ; for 2d, it’s an intel hd-5500 [integrated on-board] running intel hd graphics drivers. for the 3d stuff it’s an nvidia geforce 845m running nvidia oem drivers. all drivers are current.

has anyone ever had this happen before ?
if so, what did you do to fix it ?