I'm sorry you have been having problems. It was developed on Yosemite, and I did test. Unfortunately the bug was difficult for me to reproduce until just recent

I'm sorry you have been having problems. It was developed on Yosemite, and I did test. Unfortunately the bug was difficult for me to reproduce until just recently. This is a bug only some have been seeing related to how the OS caches images. I have submitted a fix, and the update is currently waiting for approval by Apple. Hopefully it will be available on the App Store soon.