The original iThoughts apps are effectively 'broken' on iOS8. They still run, but there are now lots of 'weird things happening'. Unfortunately I can't fix them. Back in February 2014, Apple stopped developers from issuing updates to any app which is not specifically 'optimised' for iOS7/8 (including critical bug fixes!)
I have since developed a replacement app which is optimised for iOS8/9. It's Universal (works on iPhone and iPad) and has loads of new features (see here)
It is also a 'new app' - which means it must be 'purchased again'.
Apple don't support existing customer discounts, so I'm unable to 'sweeten the pill' - sorry!