On my master site, I select Components > Multisites > Manage Sites (Site Manager). Many slave sites have an icon next to the ID with a popup: "New extension present...". I select the slave site, select Edit, make a small change, Save. Two things happen:

1) Site Details: "Warning: Invalid argument supplied for foreach() in /home/xxx/domains/xxx.com/subdomains/master/public_html/administrator/components/com_multisites/helpers/helper.php on line 603"

2) The ID icon does not go away.

Are these problems related?

How can I make the ID icon go away?

Thanks!

Are you managing JMS from the master website or from a slave site.
Normally JMS should only managed from the master website.

It seems that you are working from a slave site and that you don't have the "/multisites" directory shared 'Symbolic Link'

I am working from the master site "MA MASTER".

Website template Details > Folders and Files > "multisites" says "SL: Symbolic Link".

Also, I see on MA MASTER Site Manager that one of the slave "Prefix" is "jos_". Is that a problem?

Thanks!

If this is not a slave site but the master website, the "/multisites" directory exists.

So you don't have to go in any JMS template rule as you are on the master website and not on a slave site.

This seems inconsistent with the description of the error that let suppose that this occurs on a slave site that does not has the "multisites" directory.

All I can suggest is to cross-check again.

Edwin, sorry but I do not understand what you are saying.

I have been able to identify another reason of this error and I have fixed it in the JMS 1.2.76.
See the FAQ on how to get the latest version.
www.jms2win.com/en/faq/faq-joomla-multi-sites#cat-122