I heard from someone who is having trouble posting comments. Blogger's been kind of weird about logins since the switchover to using google accounts, so maybe that's causing the problems?
Remember, though, that if you can't get your blogger or google account to work, you can always post using the "other" identity option. This lets you just type in your name and post that way. Hopefully that will always work. If not, let me know! I can't really do much myself, but I can always file a support claim with blogger.