iOS 4.0.1 for iPhone & iOS 3.2.1 for iPad Released: Proximity Sensor Problem Fixed. New FaceTime Screen Blanking Problem Appeared

Apple released the iOS 4.0.1 firmware update for the iPhone 3G, 3GS, and 4 as well as iOS 3.2.1 for the iPad models. As you can see in the screenshot above taken during the update process, the iPad update includes:
– Improved WiFi connectivity
– Mail PDF copy/paste fix
– Video playback freeze issue fix
– Improved reliability of video out using iPad Dock Connector to VGA
– Bing added as a search option

iOS 4.0.1 for the iPhone includes:
– Unspecified bug fixes
– Improved formula for displaying wireless signal strength
It looks like the proximity sensor problem during voice calls was fixed. My iPhone 4 display reappears after moving the phone away from my head. However, there seems to be a related problem. My iPhone screen went dark after ending a FaceTime video call and stayed dark unti I pressed the display on/off button. This did not happen prior to the 4.0.1 update.
The updates had a variety of file sizes. Here’s what I saw:
– iOS 4.0.1 for iPhone 4: 579.3 MB
– iOS 4.0.1 for iPhone 3G: 305.5 MB
– iOS 3.2.1 for WiFi-only iPad: 456.9 MB