Probably because your browser is still reading from the old file in its cache.
Yes, once I had cleaned out the
"scrap" cashe I lost seeing it.
Just out of curiosity, I'll put it back later.
I should have realised earlier and created a new folder for all the tutorial pictures, so that they were kept separately and out of the general run-of-the-mill day-to-day folder.
Because once they were created I don't need to see them again.
There are too many in there now to change, but I might just move my other pictures which are not so important into the new folder and use that one a the general dumping folder.
After all it's only one extra click to access.
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edit
So moving it back to it's original place/folder also replaced the lost/broken link.
Useful to know.