The same issue and more here…
When aggregating manually it shows up the following message without doing anything:
Check currently scheduled feeds for new and updated posts.
Updating John Doe's Blog from <http://johndoe.blogspot.com/feeds/posts/default> ...
No posts were syndicated, no amount shown in the message above.
The second issue:
Even if all other plugins are deactivated and only FeedWP is activated, the wp-admin/edit.php returns a Internal Server Error 500.
Any suggestions?
Yes you are right! It is not necessary to deactivate W3TC completely, but it is enough to deactivate the Page Cache….the most important part of W3TC 🙂
Isn’t it weird?
cheers