I'm afraid (embarrassingly) I can't remember how I fixed this
- but I did get it working.
Some things to try...
+ A generic wildcard certificate for testing adhoc apps. This will mean you can only install ONE test app at a time using that certificate, but it makes things easier than having to generate a new adhoc certificate for each new app while testing. You need to remember to uninstall the old test app that uses that same certificate before trying to install the new test app.
+ Ensure you have a valid icon for you app. I seem to remember having an issue previously with the icon that caused the installation to fail with no proper error message.
+ If you use the Admob or Chartboost libraries, remember to tick the box when exporting. This was something else I had forgotten once and it led to problems.
+ There was mention previously about version and build numbers, and app names not being validated strictly enough. I think this has long been fixed but it might be worth clearing all of those boxes in the export dialog box and retyping them to ensure no invalid values are in there.
I'm afraid I am clutching at straws really but hopefully something there might help.