hi again, i looked into the subject by myself and found the "culprit" ... the issue is caused by the mod "aai-loaders-reduced-cost".
the following entry is found in the settings-updates.lua:
local loaders_mode = data.raw["string-setting"]["aai-loaders-mode"]
loaders_mode.hidden = true
loaders_mode.allowed_values = {"expensive"}
loaders_mode.default_value = "expensive"
now i changed the if-statement in loaders-modernized_0.8.14/settings-updates.lua to
if mods["aai-loaders"] and not mods["aai-loaders-electric"] and not mods["aai-loaders-reduced-cost"] then
The game loads now successfully into the main menu.
Maybe for a more dynamic approach you may check the allowed_values table instead of hunting every interfering mod down ..