Adding a new partner to partnership tax retuurn - 1065

When keying in partners social security # in K-1 worksheet, error pops up saying "enter valid id".  "I" for individual is selected.  I know this is valid number - individual is long term client.

I have completed a number of new 1065 returns this season & this has not happened and added new partners to existing 1065's & this has not happened either.

This is happening in two different 1065 returns.

Refreshed updates, does not fix.

Is there a known problem?  Sure appears to be a software issue.