iPhone, iPad & iPod touch

hi, every one
can any one help me about itunes, i have iphone 4 withe jialbreak ios4.2 and i do update for itunes to 10.1 and after that every time i sync my app. with itune asking me to remove app. from iphone.and i cant install the new app from itunes to my iphone
any solution for these or is there any alternative programs better than itunes

go on to cydia and download appsync 4.2 it should help it to work ^^
thank me if it works ^^

thanks.
i tried but still i think problem is after undated itunes every time i connect my iphone it removing all cracked apps .
am trying to find alternative for itunes for ma os10

I think I no what u mean it happens to me too so I don't bother syncing apps unless I'm desprite

thanx, it is working now just i cancel the automatic update from itunes .
no more deleting cracked app by itunes.

I CANCEL AUTOMATIC SYNC AND GO TO FILE TAB (UP TOP) ON ITUNES LOOK DOWN ON LOWER PART OF LIST AND IT SAYS "SYNC PURCHASES TO ITUNES FROM "JANE DOE" IPHONE/ IPOD. CLICK ON THAT IT WILL SYNC CRACKED APPS AND THEN ONCE DONE, I DO SYNC MY DEVICE LIKE NORMAL. I HOPE THAT HELPS :)