As was pointed out by Luvtofish on Lemon64 VDC Mode Mania just hangs on startup when using an NTSC C128. I found out that this is due to calling the IOINIT-routine at $FF84. For some reason this only works reliably on PAL, but hangs in the raster-detection on NTSC (when used from BASIC). Anyway, I fixed this as well as VDC VGA Mania by just calling $E179 instead, which is later in the IOINIT-routine at the VDC-reset (which is what is needed).
So, if you had problems with either release in NTSC-land, please re-download and try again: