Re-run Settings > Permalinks. Check .htaccess file in root of WP installation – was it generated at all? what’s in your file?
Thanks for responding @mercime. I found the cause. I reported a bug on Trac (3747).
When Front page = a Static BuddyPress page (eg, Activity), the previews do not work, nor do ugly links inside pages test page
When front page = Static Page (= a not BP Page), the previews work correctly, and also the ugly links inside pages test page
When I select Front Page = Forums, I get a “This webpage has a redirect loop” error.
I tested this on my installation, after deactivating all plugins and the default theme. I checked .htaccess, and it is correct.
I reproduced this on a new WP 3.2.1. install, with BP 1.5.1. , on a separate domain.
@henrybcn Thanks for the bug report!
@boonebgorges sure. You don’t happen to have a patch for this? It is a pretty severe issue – as site links, written in ugly format, stop working. So, anybody upgrading to 1.5, with front page = Activity has a major problem. thanks!
I just came across this same issue, I can’t preview posts – it also affects viewing the digest queue from group email subscriptions which adds /?sum=1 to the end of the url
I also tried testing setting the homepage to a static page and can confirm that with the static page I can preview and see the /?sum=1 preview
As on https://buddypress.trac.wordpress.org/ticket/3747, we’ve fixed this in BuddyPress 1.5.2 and BuddyPress 1.6. 1.5.2 will come out same day as WordPress 3.3. If anyone needs this fix sooner, try to backport it from that ticket.
Great stuff, cheers for the update @djpaul
