Seriously, why can't I post pics!

I go to attachment...attach from my computer, upload...and comp tells me "file not found" Obviously I am either doing something wrong or there is a glitch. Have macs and tried uploading from 2 of them with NO RESULTS!!!! I'm not going to take this to the Geneous Bar...although the thought has crossed my mind! Any help will be appreciated.

Without knowing more, I'd guess size had something to do with it: pixels and/or KB's

Filetype...........Max Filesize......Max Width.......Max Height
bmp....................100.0 KB...............800...................600
gif......................100.0 KB...............800...................600
jpe.....................100.0 KB...............800...................600
jpeg...................100.0 KB...............800...................600
jpg.....................100.0 KB...............800...................600
png....................100.0 KB...............800...................600

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Also try to look at the bottom of the page and see if you have authority to post images. For me it says the following:

Posting rules:
You may post new threads
You may post replies
You may post attachments
You may edit your posts

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I think in some cases (people under 100 posts for instance, maybe) they might have different rules.