Nah, not the same issue as mine then. Mine simply will not load PCSX2 if I have a megabezel slangp preset saved for that core (under the nsame "pcsx2 (alpha).slangp), and will always load if I don’t.
I have this issue with both your PS2 preset (PS2[STD][Guest]) and the GDV STD preset from the megabezel pack itself. No internal resolution scaling, but I tested with the HD preset in your community pack as well to be on the safe side.
Issue only happens with a Mega Bezel .slangp saved for pcsx2. I can use for example CRT-Hylian-Curvature or Guest-DrVenom-NTSC preset from the default retroarch shader pack and not get this issue when loading core.
This happens regardless of what global video driver I use (though of course I’m using OpenGl renderer for pcsx2, D3D11 does not load the shaders at all for me, and vulkan is not supported). It also happens regardless of my Integer Scaling and Asepct Ratio (in Video Settings or Core Settings) values.
i5-7500 || GTX980 || 16GB RAM
PCSX2 is the only core with the issue and issue only occurs with Mega Bezel shaders.