My WpForo forum has developed a strange fault and one which I cannot figure out how to solve.

Fault:

New topic contents are not being displayed I only get a blank page. The forum top level categories display just fine, its just the actual topics that seem to impacted. The newly created topic will appear in the forum category listing and the sidebar widget. Interestingly the sidebar widget does display the partial extract of the new topics content

* see evidence images to help show the above *

The forum was working perfectly fine this morning then a member reported that he posted a reply in one topic but it appeared in another. When I went to investigate the fault described above was found.

Actions thus far

• Restored the database to 24 hours prior, cleared all caches, the fault still persisted.
• Deactivated wpforo, deleted wpforo, downloaded and reinstalled. New topic contents not displaying.
• Deactivated all plug-ins, deactivated and removed wpforo, deleted wpforo, reinstalled wpforo but this has not cleared the fault.

Further Observations.

It would also seem that if I log out of the forum and view as a guest, the topic contents can now be viewed. If I then login back and click on the same topic, I just get the blank page

Really desperate now as I have a community wanting to use the forum and I've no idea how to fix this one. Would it be possible for one of the support team to login to my site and provide some assistance, please