Steps to reproduce...

 

Load the save game file.

 

Somehow today on loading my Cipher character I found my Cipher now has 1, yes 1, Dexterity.  It isn't a debuff as rest did not remove it.  I never noticed it until loading the save so sadly I don't know what exactly might have caused it.  Was it some corruption when it loaded?  Was it an after effect of the debuff I took for removing the bloods influence from Aelys?  Was it some debuff from a spider or a beetle?  I don't know.  I tried reloads, I tried resting, I tried letting my main get knocked out in combat and recovering, all no dice.  His dex stayed at a 1.

 

Here is a rar file with all my logs, including the error one, and the save file where I first noticed the issue.

 

http://www.mediafire.com/download/w51rj0dq5v55929/Dex+1+logs+and+save.rar

This happened to my Fighter (my character) when I reloaded after getting stuck in place after the Medreth fight.  It also happened to my Orlan thief after a reload (I think it was after going into the Armorer's and getting a black screen forcing a reload).

I also just noticed this happening to my druid in a save after fighting Medreth.

An earlier quick save just before the fight still has correct dexterity value (10).

Here's the save. Also includes heavily duplicated status effects (up to 9 copies).

https://www.dropbox.com/s/4h6o63emxh6nnp6/dex_1_savegame.7z?dl=0