Why Am I Getting Errors with Start-ThreadJob and Using Variables?

Yeah, you might want to ditch using `$profile` altogether. It's just not portable, and jobs run without access to your normal session variables. Creating a module is definitely the way to go. Keep your job scripts clean, and I promise it'll save you a ton of headache down the line.

Looks like you're running into issues because `$using:` doesn't work with `-InitializationScript` in `Start-ThreadJob`. It’s limited to the `-ScriptBlock`. The job doesn’t recognize the `$profile` variable frankly, since it runs in a different context. Instead, try this to run your profile inside the script block:
```
Start-ThreadJob -ScriptBlock { . $using:profile; ichild } |
Receive-Job -Wait
```
This way, you'll load the profile correctly when needed. If you plan to call this multiple times, consider creating a script block first and passing that in to keep things neat.

I agree, `$using:` is kinda tricky! Using your profile isn't the way to go; it's meant to customize your environment, not run scripts from within it. Each job runs in its own separate runspace, so you'll need to prepare the worker's environment first. You might want to create modules for your scripts instead, and use `Import-Module` inside your script blocks for ease.

Definitely consider looking into synchronized variables instead of using `$using:`. It might fit your needs better and keep things simpler! Just remember to keep it clean and focused.