HSSF POI 3.10 with HSSF APIs designed for 3.6

We're using the Apache POI 3.6 java tools to generate and manipulate MS
Excel spreadsheets. I recall that v3.8 of the POI tools was flawed somehow
for our uses. I even marked the downloaded .zip file as flawed. But, I
can't recall or find my documentation as to what the issue was. I see that
the current release is a 3.10.1. Does anyone have any experience or
knowledge about using what Scott Klement designed for POI 3.6 as a service
program, with the newest version of the POI tool at 3.10.1?

Or, maybe you recall if you had an issue with 3.8, and what that was, so
that I can test to see if its now resolved.

Thank you.