I'm having major issues with editing entries and my signature. I have been for some time, with posts too, but today I also had them with my blog, and I can't edit my sig to link to the story I just posted there.
What's going on is that the edit window appears blank--is blank. You click "edit" and you get a Preview that looks just like what you've posted or saved as a signature; but the editing window gives you nothing to edit, just the blank window. Save that, and you've effectively erased the original you're trying to edit.
I've been working around this in messages, and worked around it with my blog, by copying all from the composition window before posting. And if not for that I would have had to leave my blog as is today. But pasting in the original, making corrections, and hitting "Save" or "Save Changes" does the trick--at least so far. There's no way for this to work on signatures, at least that I can find, because I don't have a copy of my signature with all the codes for the colors and links.
Thought I should bring it to your attention.