It's me again. :-) Ever since the 0.8.4 update of WPGPlus, I've been getting the "too many redirects" problem again. It happens reliably every time I post. Nothing useful appears to be dumped to the debug log.
I have tried disabling other plugins that also run in response to a new post - e.g. the StatusNet update plugin. However, the problem of too many redirects remains. Any suggestions how I could test this further to provide more useful information to you?