BDP-S470 can't see new video files

[geologytom]

Since the latest update, M04.R.752, my S470 can't see new avi files that are shared from my Windows 7 networked PC. I can see, and play all the existing ones, but new ones added to the correct folder on my PC do not appear. Also, rather more interesting is that removing an existing file from my shared folder causes the file to disappear on the TV, but on returning it to the folder straight away it won't reappear!!

Any other experiance with this or fixes?

Thanks.