So i got a problem. I used to have another harddrive for my 360, and obviously ive had to re download some of my arcade games. Problem is that when i play some of them, i cant unlock achievements. Its happened in Brain Challenge and SF2. When i press the dashboard button i can see that my gamerscore is 0, and that i apparently havent played any games - AT ALL! I got a 80k + gamerscore and played more than 250 games i think. 
 
Anyone else noticed this bug, perhaps someone has got a solution? Help please

yes, i get that sometimes. it's the gamerscore loading. i would say don't worry about it. maybe ur doing something wrong if u can't get the achievement.

" So i got a problem. I used to have another harddrive for my 360, and obviously ive had to re download some of my arcade games. Problem is that when i play some of them, i cant unlock achievements. Its happened in Brain Challenge and SF2. When i press the dashboard button i can see that my gamerscore is 0, and that i apparently havent played any games - AT ALL! I got a 80k + gamerscore and played more than 250 games i think.   Anyone else noticed this bug, perhaps someone has got a solution? Help please "

Its not that my score is resetted, but i have to sign out and in again to reload my score. And when i do that, it doesnt say that i have played those games on my last played list.

If you copied games from hardrive to MU/MU to harddrive using an account that didn't own them, you can't earn gamerscore in that game for some reason, even if the account you used to buy the game originally is signed in. If this is the case, download the games again and don't move them using any other account. 
 
That probably isn't the problem, but it's worth checking just in case.

"Its not that my score is resetted, but i have to sign out and in again to reload my score. And when i do that, it doesnt say that i have played those games on my last played list. "

" If you copied games from hardrive to MU/MU to harddrive using an account that didn't own them, you can't earn gamerscore in that game for some reason, even if the account you used to buy the game originally is signed in. If this is the case, download the games again and don't move them using any other account.  That probably isn't the problem, but it's worth checking just in case. "