Thank you for your post.
I was able to replicate the problem on both Mac OS X 10.5.8 (Leopard) and Mac OS X 10.6.3 (Snow Leopard). This problem does not occur on Windows.
I have forwarded your post to our Development and Software Quality Assurance (Testing) departments for review and confirmation. In the mean time, your workaround of revisiting the script after hiding is the only option.