I used IE Mod and Eternity Keeper. The issue stops after a game restart. But most certainly happens after the Prologue and stays that way until game restart.
Extracting the file is fine on my side. Did you use 7zip? That was the compression program I used.
The forum doesn't allow me to upload the save file. Only the output log.
output_log.txt
More details.
I deleted all mods and ran a game cache integrity check on Steam. Started a new game.
It happens after the Prologue, right after leaving Cilant Lis and persistent throughout since.
And, yes. Happens when I switch from range to melee.
Here's the new save file and output log.
https://drive.google.com/open?id=0B7EycI2PX73yaGRTWHpkODA1Wlk
Seems to only happen when I switch to dual wield melee.
and my output log
https://drive.google.com/file/d/0B7EycI2PX73ySi1jNlVjVHJMOFE/view?usp=sharing
On a very short test I did, the 'auto-attack' icon shown on the character portrait during combat was shown as 'Knockdown' icon instead. Only happens on the player character. A rogue hearth orlan.