DetailsSummary Macro no longer working since last upgrade to 4.2.5

The DetailSummary macro has stopped working on our hosted confluence site site the last system upgrade.

We get the following error:
Error rendering macro 'detailssummary' : [Ljava.lang.Object; cannot be cast to com.atlassian.confluence.labels.Labelling

I thought this might be a support issue, but when I checked on Atlassian's documentation page for the macro, it shows the same error, so it appears you are having the same problem we are. See here:
https://confluence.atlassian.com/display/DOC/Detailssummary+Macro

If this is just us doing something wrong I apologise for posting here.

Stu French