SEC requires amendments to old filings if there are "material changes." The changes here were routine and management-related, to wit, Bruce Jones (CFO) and Herman Hohauser (VP) were added, Pojenzy and Selby withdrew.
These are my opinions and sentiments only. Take them for what they're worth. Do your DD. Buying stocks is risky!
"If we could sell our experiences for what they cost us, we'd all be millionaires." -Abigail van Buren (a/k/a Dear Abby)