Update: 1 January 2018
Blackboard are still investigating the issue.
Where a high number of seconds (in the tens of thousands) is shown as the conversion time, the preview will not generate, even after waiting and refreshing.
This is known to Blackboard and we are not the only institution that is experiencing these issues.
The only work around currently is to download the submission.
For the latest information please see http://libguides.uos.ac.uk/blog/learn-upgrade-complete-9871 where we will update when we know more.
Thank you and sorry for the inconvenience caused.
We are aware of an issue with the file conversion preview of submitted work, this is an issue for both academics and students.
When a student submits their work, they should see a preview to confirm it is the correct document, this preview is not auto-loading and is still not displaying for some students after a refresh of the page.
When an academic access a student submission to annotate feedback the file is not converting to be editable. For some academics 'refreshing' the page does then load the preview, but not all.
This issue has been raised with Blackboard and we are awaiting a response.
Sorry for the inconvenience caused by this issue.