from http://patch-tag.com/h/troubleshoot-wiki-browsing
"Permissions errors on darcs push
There's a patch-tag bug that prevents darcs push in some instances due
to permissions errors. We're not sure why though we're working on it.
Meanwhile if you have this problem you can click the "Fix Push
Permissions" item in the main repo menu and this problem should go
away."
Does that help?
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I had tried that several times with no benefit. For some reason,
however, immediately after I sent my email, I tried pushing again and
it worked. I did nothing different.
- Jake