As noted before, the dialog boxes appearing at the cursor position instead of at the center are a feature being tested. If you don't like it reinstall the program (no need to download again). This make take several tries. Chances are that the old behavior will be reinstated.
Have never seen the timeline and file folders scroll. Capture that action if possible, save to a file, then upload it, get a link and share it here.
Various issues can result in export irregularities, such as editing errors, hardware incompatibilities, settings, etc. Upload a project that does this and someone will check it out. In the absence of running the project on another PC, little can be determined.
What version of Videopad is being used? Look at the bottom-left corner of the window or click the Menu, then HELP | ABOUT.