I updated the "under construction" plug in after the error on line 135. As reported earlier (under a different topic), after updates to other plugins, I get the following error message:
Briefly unavailable for scheduled maintenance. Check back in a minute.
After plugins are updated, I check the splash page and is says "Briefly unavailable ...", so the "[url ... is coming soon]" page is MIA.
A quick check of the wordpress root reveals that the ".maintenance" file is left in the root directory. Deleted the ".maintenance" file and everything is working hunky dory.
So it's possible the "under construction" plug in isn't allowing updates to complete the last step (deleting the ".maintenance" file on the wordpress site's root folder).
I don't have this plugin installed on other wordpress sites I'm running. And don't have any plugin update problems. Since the problem site is the only one running "under construction" plugin, this has got to be some sort of WAD failure.