The update to 1.5.2 to fix the crashing of RTF files has not done so completely. Certain RTF files still crash for me , repeatedly and reproducibly, on iOS 8.1.1 on an iPad Air 2. Most are OK, and I can’t discern anything different about the ones that crash. They are simple RTF files without images, some with hyperlinks, some without.
See my reply in the other thread. Fixed and 1.5.3 on it’s way to Apple.