Have you rebooted since the update? If not, try that first. If it still persists, uninstall both of them and redownload/install. Not sure about helix, i only use Launcher Pro and it works great with froyo.
I had a problem with a few apps force closing after the update,I just went into the market and installed them again and they worked fine. If you look at your downloads in the market and they're not listed as installed,you need to reinstall them again. That's how I got 3 of mine to work...hope it helps