Format of text boxes changing

Help please. I have a new laptop and when I open existing Storyline 1 files, the text formatting is all awry: most shapes with text including callouts appear larger and misaligned, often appearing off the slide.  I have checked:

• The text size - generally this is shown as the same on both laptops, although some lines of text have actually reduced in size. Although an issue, this is not the cause of the problem.
• The line spacing - this is shown as being the same, so this is not the problem.
• The Story size - this is shown as being the same, so this is not the problem.
• The screen resolution - this is different, but changing it to match doesn't correct it.
• I have reinstalled Storyline 1.

The same issue occurs with files I have created as well as colleagues on different projects created on different PCs. I am at a loss as to what is causing the problem and, more importantly, how to correct it.