While the lack of file uploading has been mentioned before, I wasn't able to find any mention of the other issues I am having.
I wanted to put a screenshot of my avatar and a photo of myself in my profile, but all methods I tried failed.
All the file upload menu entries just do nothing.
The snapshot to disk menu entry made my avatar do some wierd photo taking motion with his hands, but I was unable to find any new texture in my inventory, or any new image file on my hard drive.
The snapshot menu entry shows a complex looking dialog, but then crashes the client a second later. This happened consistantly. I never got much of a chance to read the complex looking dialog.
In desperation, I tried out the final screen image that is left when you log out. I was never able to get anything like a reliable pose, and the lack of upload ability means I can't do anything with it anyway.
Looks like my only option is grab a screenshot of the window using gimp, and find a friendly Windows user I can email images to, who will upload them, meet me in world, then pass the resulting textures to me.
There has to be a better way.