Pier Solar loading error after creating a save file in retroarch

[gabberhead]

i have tested pier solar today, but the game is not loading. after choosing a language and creating a save file at the beginning and then after prepeaing 64meg cardridge message, u must press start button to initialize saves. but the the following error message appears when u do that: "something wrong happend!" and without a proper savegame, u can not start the game.
then i tested the same rom with the wide core of genesis plus gx. with this core the save file is created and the game is starting without a problem. even with the cd soundtrack in combination with the rom file.
the cores are both the newest ones.

[gabberhead]

i found the problem. the problem is, if u set run_ahead_enabled = "true", the described problem happens. if u set this to false, the game is starting without problem.