Jim. with Beta7m, on my system monitor B is now showing a clone of monitor A. - (Also the overall width when scrolling has been reduced by about a half.)
Current system....
AMD Athlon XP2500+
1535MB
nVidia 7900GS (Driver 178.24)
Dx 9.0c (Nov.2008)
Win2kPro SP4
Dual VP920 ViewSonic Monitors
I Have the same problem in my system:
Intel Pentium D 2.80 GHz X 2
RAM 4 GB
ATI Radeon 1300, 256 MB
Dx 9.0c (Nov.2008)
Win Vista Home Premium 32 bit