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After I was updating some apps like pokopang camera360 and so on, i couldn't open those apps. It just shown as a black window with icon+the name of apps at the top. Please help me to fix this 
Hi there
Maybe the problem is in those apps? Contact the developer via mail.
Cheers.
.....Also You can try:
Settings>Apps>All>Choose app you want and then clear cache/data +force stop + restart your phone.
After that run those apps again.
if your firmware version is 15.3.A.0.26 and apps which you cannot start are placed on internal storage then go to settings-applications and move them to the phone memory. Also some apps can go to internal storage after update even if they had been moved to the phone before. In such case you have to move them to phone again. This is a known bug of .26 firmware - some apps can't run from internal storage. Perhaps Camera360 is one of such apps. Use this workaround while waiting for a fix from Sony.