Describe your issues in your own language then. It's their job to translate it.

Ive had a similar issue with an smg going from shoulder to inventory.

Well I played again a few hours later, and still wouldnt work.

Had this problem repeatedly for a few days but became unbearable yesterday, I've also had settings reset with a new character, loading of old characters lost and continuous rubberbanding, usually occurring with an inability to open doors, switch items, use items, grab/drop/equip items.

This sort of thing look familiar?
http://www.youtube.com/watch?v=08OLb7qlwuc&feature=youtu.be

Came across basically same problem tonight while holding a torch.

http://www.youtube.com/watch?v=OxG5iG8fOGk&feature=youtu.be

http://www.youtube.com/watch?v=OxG5iG8fOGk&feature=youtu.be

http://www.youtube.com/watch?v=5sZYFb38l8E&feature=youtu.be

Don't know if these help. In both I guess you could say there is a line of "sight" but there's something clearly wrong with the AI in both.

http://www.youtube.com/watch?v=I60RCBrmUZ8

http://www.youtube.com/watch?v=kCCvycc8i6U&feature=youtu.be

Do you mean this kind of thing?

http://www.youtube.com/watch?v=x5KCg-t8gAs

I was intending on killing the zeds you see first which is why I came in through the front of the shop but I didn't see a zed by the front doors and one certainly didn't see me.