[Zubersoft]

When you say, "Change visualization setting", what does that mean exactly? Are you trying to change the display mode (single page, two pages, vertical scrolling, half page), or are you referring to something else? When you say the app becomes unresponsive and glitchy, is the app just stuttering? Do you have to terminate the app? Does it stay that way until the app is restarted? Also, is this with version 3.7.4? You can find the version number under Settings->About.

Thanks,
Mike