Parsing error urgent

After updating RW to 7.2.2 (and also installing the associated Stacks update) a project that up to now has had no problems at all–either locally or when published–suddenly exhibits this problem when trying to preview:

Parse error: parse error in /private/var/folders/y4/b3_7n68j6jgdds79h0wllg_h0000gs/T/com.realmacsoftware.rapidweaver/RapidWeaver/42260/document-0x7fcdd7c38110/RWDocumentPagePreview/Spokane/index.php on line 196

This error message appears on about 70% of my pages with corresponding changes to the last 2 elements depending on which page is involved.

I posted this question as a conversation–and marked it urgent–5 days ago and have had no response whatever from RW Support.

Since the problem appeared only after I installed the 7.2.2 update, should I revert to my previous version?
I’ll appreciate any suggestions, as I’m stalled. My business is holding while waiting for a solution here.

Bill, do you have more information which page type you are using there? Is it a Stacks page?

Yes, they’re all Stacks pages; but some of my Stacks pages don’t exhibit this problem.

Then most probably one of the stack elements on these pages are causing that problem.

Please check that all stack elements are up to date (updater functionality).

I guess when you duplicate the page, you get the same errors on the duplicated page? I would from there on remove one by one stack elements from the duplicated page to see which one causes the problem.

But don’t forget to make a backup of your project before that.