Well let's start with what you're using and see if something on your end may be causing the problem.
When was the last time you dumped the cache? This is where I'd start looking for the problem.
Firefox: Tools > Clear Private Data Make sure "cache" is selected. Click "clear private data."
IE: Tools > options > on the General Tab under Temporary Internet Files... click Clear temporary files.
See if that works for you.
Ten Forward - 2014 Escape 5.0 TA
Double Yolk - 1988 16' Scamp Deluxe