Great, thanks. 

And yes, I reveiwed the change log from 1.84 and the error I was experiencing w/ backlash was fixed in V 1.90 .

Do you know if the configuration files are compatible from 1.84 to the current version? 

Is there anything I should be aware of upgrading?

Its a big leap but you should still be fine updating and using the same xml.
Best bet is to rename your current Mach3 folder to, for example, OldMach3 and then install the latest version and then copy over your xml. That way if things go wrong you can easily go back just by renaming again, may have to go back to the older driver though.
Hood

Hello,
Did you ever get this working, the backlash compensation?
I turned on the backlash compensation and get continued limit sw errors! I have the same Taig 3000 DSLS mill.