Need help with green flickering MP4 outputs from Hybrid

[Bogiesmokes]

Hello!

I've been experimenting and making constant adjustments made to my VirtualDub2 & Hybrid workflows for a batch of .avi captures I'm deinterlacing in VDub via AviSynth+ and converting to .mp4 in Hybrid. For this batch, I'm trying to upscale to HD best I can while retaining that 640x480 natural 'look', for Premiere Pro editing. I made a wrong adjustment somewhere in Hybrid that has led to my MP4 output files to all have constant green light flickering (strobe-like) which fills the entire frame (see attached). If anyone could review my info below and the attached Hybrid settings, and let me know what they may see as a problem(s), I'd really appreciate it.

My first test from VirtualDub2 through Hybrid worked well, but ever since I made an adjustment, I cannot figure out what I've done (or selected) wrong...

The raw .avi files were captured in 720x480. My AviSynth+ script ends with (entire script below):
Crop(8, 0, -8, 0) #704x480 (PAR .9)
Spline36Resize(1280, 960) #Corrected to 4:3 (PAR 1:1) 'sq pix'

Then in Hybrid under Crop/Resize tab, I check 'Resize' with a target resolution of 920x1080. I then check 'Letterbox' and add 320 padding to both left and right, and 60 to both top and bottom. I am only trying this time of Resizing on this particular batch of captures.

My AviSynth+ script:

AVISource("D:\source")
ConvertToYV12(interlaced=true, matrix="Rec601")
AssumeTFF()
QTGMC(preset="fast", EZKeepGrain=0.5, MatchEnhance=0.8, sharpness=0.6)
FFT3DFilter(sigma=1.5, bt=3, sharpen=0.4)
DeHalo_alpha(rx=2.0, ry=2.0, darkstr=0.8, brightstr=1.0)
MCTemporalDenoise(settings="medium", chroma=true, enhance=true)
LSFMod(strength=50, Smode=3, Smethod=2) #with & without
Tweak(hue=0, sat=1.1, bright=5, cont=1.05)
Crop(8, 0, -8, 0) # 704x480 (PAR .9)
Spline36Resize(1280, 960) # Corrected 4:3 (PAR 1:1) for sq pix



I'd really appreciate any and all thoughts especially on getting the conversions back on track....thank you!