RE: Problems changing avatar
It reloads the page without using the cache. In the cache, files (mostly images) are stored to load pages faster: it's faster to load from the hard drive than from a web server.
When a picture changes, the old one in the cache doesn't change and this one will normally be used. When you use Ctrl+F5, it will always load all files from the web server: may be slower, but the correct images will be shown.
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