Until someone drops by with current information on this specific issue, you can place the program in the exclusion list - which will tell WindowBlinds not to skin the program and should allow it to operate correctly.
To select a new exclusion:
WindowBlinds configuration panel > Per Application button > Add per application setting button > navigate to the program's ".exe" file > click Open > use the resulting dialog to select the level of exclusion (from Total - Partial) > click "Apply Changes" link in the WB configuration panel.