I just updated to 1.8.1 and now I basically cannot do anything with any of my mercurial repos. All of their states are detached from the branches and when I try to update to any state along a branch, it completes, but actually does nothing. Then, when I try to update --clean, it gives me an error:

hg update -y -r 142 --clean
abort: The system cannot find the file specified

Then, when I try to stage a changed file, I get the same error:

hg add -y content/mu-plugins/rainmaker
abort: The system cannot find the file specified

When I try to pull in remote changes to a repo:

hg pull -u C:\Users\Admin\AppData\Local\Temp\fnc5tnov.kzu
pulling from C:\Users\Admin\AppData\Local\Temp\fnc5tnov.kzu
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files

abort: The system cannot find the file specified

I'm dead in the water here. I can't do any work until this is resolved!