Thanks. Downloaded and reset the defaults for the participant role to no avail. I also created a new user with no results. It appears this is only affecting the participant role.
I also noticed that the forums page was not accurately showing the latest(freshness) post in each category – i.e. the latest post listed was older than the most recent post once you click through into the category.
Yes I went down the list, checking each time and none resolved this issue.
When Participants click on the forum topic, they get redirected to the new post submit form, and can also post. I deleted buddypress and reinstalled but I’m afraid whatever changed in the role is deep in the code.