Do you have the Y axis configured and enabled ?
Can you jog the Y ?
Post your XML.
The XML is your Mach configuration file. It is located in the main Mach3 folder and will have the name of the profile you are using. For example, if you are using the standard Mill profile it will be called Mach3Mill.xml.
You will need to rename it for the forum to accept it. Copy it to your desktop and rename it, something like YOUR_NAME.xml then use the additional options button on the reply page to browse to it and attach it to your reply. The forum will only accept a file name that has never been submitted before.
Russ