Google index problem

[Plus]

Google just index user profile.

My Google index count is dropping every day. My site is 18 years old. It all started with an update to the new version. Does anyone have any information on the subject?

[Kindred]

So, what else did you change?

What version did you upgrade from?
Did you have any sort of url changing, like prettyurls, which you no longer have?

What's being removed from the indexing?