Okay, thanks Rob!
BTW I have no idea why my computer can’t make good signing requests.
1.) Uninstalled Xcode
2.) Restarted
3.) Reset Keychain Access to Default
4.) Ran Keychain Access First Aid
5.) Installed Xcode from Mac App Store
6.) Restarted
7.) Revoked my Dist. and Dev. Certificates from developer.apple.com
8.) Created Signing Request in Keychain Access
9.) Generated Dist. and Dev. Certificates
10.) Generated new App ID
11.) Created new Dev. Provisioning Profile
12.) Started Xcode
13.) Added account in Xcode Preferences
14.) Refreshed to find Certificates and Profiles
15.) Removed all provisioning profiles from iPad in Xcode
16.) Added new Dev. profile to iPad
17.) Quit and Restarted Xcode
18.) Installed today’s Corona SDK Daily Build
19.) Opened app, published using Dev. profile
20.) In Xcode, tried to add app to iPad
21.) Got error App Installation Failed. The application does not have a valid signature.
And again, on my wife’s MacBook Pro, no problems whatsoever. It’s all on mine even after reinstalling Xcode and setting Keychain to Default.