[HELP] No preview window

[Selur]

if you paste:

import vapoursynth as vs
core = vs.core
import site
clip = core.std.BlankClip()
clip = core.text.Text(clip, str(core))
clip = core.std.Trim(clip=clip, first=0, last=1)
clip.set_output()

Do you see:

do you see the same text in the preview window, or does it again simply close?
If you see a different text, what does it say? (I suspect at least the '_Number of Threads' should be different on your system)
If the Log in the Editor does show an error, what does it say?

Cu Selur