Yes, it does. Thanks to everyone who helped. Let's hope a GHC patch comes out soon.
Hi Alaxandros,
I just uploaded a new version of yesod-json (0.1.1.1) which forces
blaze-textual to be < 0.2. Can you try:
cabal update && cabal install yesod-json && cabal install yesod
and see if that fixes the problem?
Thanks,
Michael