
this wad txt file said it for GZDoom.
This bug happened when I dive in 3D floor-like of "water".
and I toggle automap and get this result.
(Sometimes this bug doesn't happened...)
Attachment is screenshot of bug. (I'm sorry it's a little dark.

<EDIT : This bug happened again when I see the "water"...
added some attachment.>
<2nd EDIT : I forgot listed my PC spec.
AMD Athlon 64 X2 3600+ @ 2.0GHz 1G RAM
GeForce 7300GT 128MB/128bit with ForceWare 91.47
Windows XP SP2 (fully Windows update.)>