I have the same thing happening here but it's on the ground in the woods. The log has rotted away and left only the bark and some residue. I thought about grabbing a section of the bark and making a magazine (anyone remember those?) rack for one of the bathrooms. But it really makes excellent fire starters!
No problems there, just need to work on getting vertical again. Haha! Everything was normal then BAM, it hit me quick.