We have updated our Chrome app so ETC account address is different from ETH.
If you sent ETC before the update, you'll need to go through a complex setup to move them (otherwise you'll send your ETH also because of replay attack).
We are going to update this page with information, in the mean time feel free to contact our support with your questions.
If you already used a splitter before you sent ETC to the old address
You can manually install the previous version of the Chrome app and move your funds to your new address (which you would have previously taken from the new version)