Thank you for your post.
I have forwarded both issues (up arrow and command-right arrow) to our Development and Software Quality Assurance (Testing) departments so they are made aware of these issues.
I had Spaces turned on previously, so I ran into the same problem. However, now that I have Spaces turned off, I cannot duplicate the problem. That is, I'm able to press command-right arrow and it takes me to the end of the line in both FileMaker Pro 9 and FileMaker Pro 10.
Does this occur only on one file or all files?
Yes, in all files and calculation boxes, but not always (I mean it can happen in any file, but it doesn't happen everytime).
At least with 9 it was consistent (always two lines)
Spaces is turned off here.