You can also try to reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

• Press and hold Shift and left-click the Reload button.
• Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• Press "Command + Shift + R" (Mac)

Which security software (firewall, anti-virus) do you have?

Boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.

Thanks for your answer. I told you I was a novice. When you mentioned a reload button, I had no idea until I did a search and found that this was the Refresh button. No problem there. Next time I have a problem, I shall hold Shift and press the Reload (Refresh) button to see if that helps. Shall also try your suggestion of Control+Shift+R. I use avg professional as my virus security software. As for the last thing you suggest about Botting the computer in safe mode, I am too scared to try thyat one. It is beyond me. I have seen my computer technician do that in the past. However, hopefully your first two suggestions will help.

I do want to thank you not only for your reply but also for your vey prompt reply. I had only posted the question a matter of minutes ago.

Thank you.

Anthony

I just thought. What about the part of my question:

Underneath that there is a box which says Override Automatic Cache Management. Underneath that is a greyed out line which says Limit Cache to 350 Mb of space.

If I tick that box will my problem be automatically solved so I don't have to manually clear cache when I have a problem with embedded pictures etc in an email I have received?

Will this help?

Thanks,

Anthony

You can temporarily disable automatic cache management if you want to adjust the maximum that Firefox will use.
The current default maximum is 256 MB (browser.cache.disk.capacity).
If clearing the cache works then probably a reload and bypassing the cache (Ctrl+F5 or hold down Shift and left-click reload) will work as well.
So you can give that a try.

The problem just came up again. Neither of your first two suggestions solved the porblem, nor did manually clearing the cache. The only way I could see the message which was text and a picture was to load another browser, in this case Safari.

Sorry...I thought you had solved it all for me. It obviously is not related to the cache.

Sometimes when I simply close Firefox and reopen it, the problem rectifies, but not this time.

Again, thanks for your help.

Anthony