I have found that the scripting functions BFS.SetSize and BFS.SetSizeAndLocation do not set the window size to the input parameters. This is probably similar to earlier 7.3Beta problems with setting window size in the 'Function/Custom Function Actions' section where the size that was input and the size that the window was created differed by 5-10 pixels. The problem was corrected there so it looks like a similar correction needs to be implemented in the BFS.SetSize and BFS.SetSizeAndLocation scripting functions.

As an example, I created a script that called BFS.SetSize (window, 1000, 1000) and applied this to a command prompt window. The output shown by interactive Display Fusion (dragging the window and observing the values Display Fusion shows in the lower right corner) was 990 x 995. For the Component Services application (dcomcnfg.exe) I see a value of 994 x 997.

Something to add to the bug list.