problem with connexion USB ( MTP and MSC ) and pc companion

[ilo]

Yesterday, I connected my smartphone on my pc for the first time (via USB cable). 

My phone asks if I want to install PC Companion, I click Install.

Everything happens normally and I succeed in transfer my contacts from the PC to the smartphone.

I also did an update for the smartphone,

and since that time:

1 - PC Companion does not recognize my phone (in MTP or MSC mode)
2 - the phone will no longer charge via my PC in MTP mode (MSC mode the phone is charging!)
3 - USB icon appears when I connect my phone to the PC in MSC mode but not in MTP mode (though in MTP mode, when I go to Settings USB connectivity, my phone indicates that the USB cable is plugged in!)

I restored and rebooted the phone and the problems are the same.

Thank you for helping me.

[ilo · Accepted solution]

I think I managed to solve the problem :

You can try to enable or disable the USB debug option found under Development settings in the phone.

(  http://www.brorsoft.com/sony-xperia/sony-xperia-usb-connection-connect-sony-xperia-to-pc.html  )