Problems uploading pics -- need help Blotanical friends!

Yesterday, I uploaded a picture to my blog using Picasa, the default vehicle for posting to Blogger, and was leisurely writing my post when suddenly, the picture disappeared and was replaced with an error message. Subsequent attempts at posting photos since then have failed.

I am NOT a computer geek in the least, and have found that Blogger and Picasa are not really that helpful in solving the issue.

So, my questions are:

Has anyone else been experiencing issues similar to this recently, indicating it may be a general Blogger problem?

Does anyone have any idea what may have happened and how to correct it?

How else do people post images to their sites?????

Help!