When we modified some AX Enterprise Portal web parts and tried to redeploy it to the Enterprise Portal in a 64 bit Windows 2008 R2 server, we found that those new fields we added into the AX web parts did not appear in the web sites some times.
It is caused by the axwebparts.cab that was not deployed successfully.
Go to SharePoint Central Administration –> Operation –> Global Configuration –> Solution Management, Click the "axwebparts.cab" and then click the button "Deploy Solution" in the Solution Properties web page. Choose the Enterprise Portal website to deploy. After that, run the command using the Command Prompt window :
C:\Program Files\Microsoft Dynamics AX\50\Setup\AxUpdatePortal -updateWebSites -iisreset
If you get any error to deploy it using the command, you can add -verbose "C:\EP Error\deploy.log" after -iisreset. Check the log file to see what cause the deploy error.
The issue can be fixed after that.