[This was originally posted Nov. 24th, 2009 on the old nabble lists, but was never addressed.]
I have a program that spawns a wgnuplot process by: "wgnuplot datafile.gp -" in MS Windows.
For version 4.2, the spawned wgnuplot process gets killed when the plot window is closed. For version 4.3+ the plot window goes away, but the wgnuplot process sticks around. This causes problems after a while as there end up being many wgnuplot processes running in the background. Did something change between 4.2 and 4.3+ that would cause this behavior? The only other difference is that I'm running the 4.3+ wgnuplot with a datafile.gp that adds the enhanced, size, and title arguments to the set term wxt command.
I tried this with a different terminal type (windows) instead of wxt, and did not see the same behavior, so perhaps it is a bug with the wxt terminal in windows. I attempted other terminal types, but couldn't get any other ones to run with the 4.3 or 4.5 win32 binaries.