Having some problems – PDF Pro 2 - The ultimate PDF app Review

I have used this app and its predecessor for a while now and been very happy with them. As of late I cannot use it as it will crash after about 30-45 seconds. I am using it to read blueprints downloaded from Dropbox on both an iPhone 6 and an iPad 2. Same problem with either device.
Review by Dozerman6 on PDF Pro 2 - The ultimate PDF app.