This is an intermitted problem, but every third/fourth time I run a supervalidate, I get a new mysterious, and empty category named ACCT_XXXX (where XXXX is usually some numbers/letters).
Supervalidate log reports this (snippet):
Quicken repaired damaged transaction index. No action required.
Quicken found an invalid transaction and removed it. "ACCT_1db7" 0/ 0/1900
Quicken repaired some transaction information. No action required.
"ACCT_1db7" 0/ 0/1900
Summary:
Quicken repaired 1 accounts. No action required.
I've reported this before in "Report a bug" but I've never heard of any resolution (for ANY matter reported that way in fact - wishing there were a tracking number associated with those problems, but that would be a different matter).