I am posting this on a few forums as I am at my wits end trying to resolve this issue. It seems to effect a lot of people and there are posts on the apple forums, but no solution anywhere. So I am posting this on the mac pro forum as you guys seem a lot more knowledgeable than those on the OSX forum The basic problem is this - I am able to write to Windows SMB mounted shares but not READ. I can create directories on the share, I can copy files from my mac to the share, and I can happily browse the share .... but not read/execute files! For example, I want to use a firefox.dmg file on my home server (running WHS). The server is called bigbox and the path to the file is Software/OSX/firefox3.07.dmg See the screenshot here which shows all the permissions at every level and I have read and write everywhere (As I should because I am connecting as bigbox\administrator) http://erzz.com/downloads/errorcode36.jpg If I try to execute the file directly of the share I get the input/output error (also included in the screenshot), if I try to copy the file from the share to my mac I get the error code 36 (also included in the screenshot) and if I try and copy via terminal I get "cp: Firefox 3.0.7.dmg: Input/output error" Now to add some further mystery I WAS able to use these shares just fine with a fresh install of 10a432. I know this because I installed most of the software on the system from this same share. Thus one of the two(?) updates since could be the culprit? Seriously, this is about the 15th issue I have spent many hours on already with Snow Leopard..... whatever happened to 'Just Works' ???