File Refresh problems

I am having a very strange problem where I am (in this instance) updating my Opera browser and the CSS files within my STYLES folder (for those that know opera) disappear. This has happened for the last few updates/builds I have processed (at least that I have noticed).
I am not saying it is related to opera, but it is where I noticed the problem.
Refreshing with the refresh button does make the files appear but they are shown in Explorer ... Retsrating Dopus shows the files.

This is very strange behavior and is the best I can describe it.

P.S. I have the folder tree panel locked, but as far as I know, the files should should still refresh correctly.

Here's how to diagnose what's going on: Changes to folders are not being detected