I'd try that app on other PCs to see if it's a software issue or a machine issue.
I am looking for e-reader software that will work with Windows 7 and has an automatic scroll feature. My wife is disabled and needs this feature to read without needing someone to turn pages for her. She had been using and app called eReader Pro for Windows (from ereader.com) but it mysteriously stopped working on her machine. She is currently using Adobe Reader which has a scroll feature, but it does not work as well. Any ideas?