well I found the problem. New kernel builds (from -14 on) ship r818x module for my wireless NIC but this module doesn't support well my card. r818x module & ndiswrapper were both loaded, giving problems. I unloaded r818x and modprobed only ndiswrapper and wireless is working fine now.
now... r818x was the problem, not ndiswrapper.
well I found the problem. New kernel builds (from -14 on) ship r818x module for my wireless NIC but this module doesn't support well my card. r818x module & ndiswrapper were both loaded, giving problems. I unloaded r818x and modprobed only ndiswrapper and wireless is working fine now.
now... r818x was the problem, not ndiswrapper.