Site workflows not available after feature activation

Hi there,

I've created 2 custom site workflows via Visual Studio.  When I deploy the solution via Visual Studio....the workflows are available for me to use and execute without issues.

But when I deploy them via powershell, the workflows do no appear and are not available in the site workflow list.

Uninstall-SPSolution -Identity "abc.wsp"
Remove-SPSolution –Identity "abc.wsp" -force
Add-SPSolution -LiteralPath "E:\Deployments\abc.wsp"
Install-SPSolution –Identity abc.wsp  -GACDeployment

I've attempted to deactivate/activate the feature via powershell and site settings.....i've restarted iis a dozen times.....

I've also monitored the ULS while deploying/installing the solution.....no errors.

What is Visual Studio doing that I'm not?

Thanks,
Eric