Did you copy the one from images accross?
the .htaccess file is a security measure to stop hackers uploading and running scripts, for some bizarre reason, very very occasionally (about 5 or 6 times during the time ih2 and ih3 have used used .htaccess files) this has happened, my guess (and it is a guess) is that its something to do with ownership of the folder and that php may be running as nobody or something.
Anyway its a server permissions/ownership problem, which is way above my understanding of servery things
ALSO all those files in the /cache folder are errors on your site, you need to look at them
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