Right click on menu bar brings up menu to: add applets, change panel settings, etc. When I try to choose any, including "system settings" - Nothing. No pop-ups. Only change to SW is updating Linux Mint Cinnamon from Serena to Sylvia. Did I break something fixable or should I try updating to a newer version?

I came across this trying to use multiple monitors but that's another thread.

I'd try a left click to bring up the menu.

Can you open a terminal?

Perhaps you can summarize any customizations you may have already done to your system, if this applies.

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Thank you for your reply.

I also tried the standard >Menu >Preferences >System Settings with the same result.
I can certainly open a termminal. I don't recall any customizations that I would have done as I don't think I'm advanced enough to do that.

I missed that you did an upgrade.

To be honest, I'm not a great fan of that, in spite of having used Linux for years. I just install fresh versus trust the updates. But it should work, I'm just not the right person to make suggestions.

For version 19, which I think is Sylvia (?)
The menu contains a "Control Center" and that opens a panel which gives you access to software installs and hardware settings, etc.

I was thinking that under the command line you could invoke the program which the menu normally gives you.

But also thinking that the Control Center is a menu panel and it's all the stuff under that panel which are programs that get run, and you can opt to run them via the command line.

You are not seeing a Control Center choice in your menu?