hi all , i have updated my iphone to 2.1 with winpwn 2 days ago , and now i am having an issue with appstore , whenever i install an app from there , my springboard crashs and it put my iphone in safe mode , i have to reboot my iphone to fix it and everything comes back to normal , i tried with multiple apps from the appstore , as soon as the app finish installing , my fone lock itself , and then i slide to unlock , and the message appear again saying that springboard has been crashed due to a recent installation or removal ,, and its in a safe mode

any ideas or solution will be much appreciated
thank you in advance