I have 4 different GTA SA directories, one vanilla and the other 3 are modded. Few weeks ago I was able to use all these directories without any problems, one time I had to check something on the single player game and since then I couldn't use any of the modded directories, the vanilla directory still works fine. I tried reinstalling the game and SA:MP, at the first time it works but when I quit the game and try to go in again the screen just "flashes" and the game shuts down. I tracked it through task manager, the gta sa file works for few seconds and then it goes off. I tried compatibility solutions, some of them just flashes and some start the game then it stops working and some give me the opcode report file of SA:MP.
There are no problems on the mods, they were all working fine like I said before but the moment I entered single player everything got fucked.