Chrome doesn't auto update extensions

I'm using portable chrome to wrap my web app extension in and it works great with the exception of the fact that chrome portable never seems to automatically update extensions.

I can specify the command line argument to force chrome portable to update extensions every X seconds and this does work however when it does end up installing an update it closes chrome portable automatically.

Although the command line argument fixes the updating problem, I can't have my web app close down automatically every time I release an update.

Does anyone know of any solutions to this?