Thank you for your post.
I am able to replicate the issue under Mac OS X 10.10.2 and Mac OS X 10.9.5. Under Windows 7, I am unable to set a different separator between hours and minutes and between minutes and seconds.
I have sent your posting along with my findings to our Development and Testing departments for review. When I receive any feedback, I will let you know.
As a partial work around, a calculation can extract hours, minutes, seconds as separate values and put what every characters you want for separators between each value.
@TSGal: Thanks a lot. This is exactly what I was looking for.
@PhilModJunk: Thanks for your efforts. However, this is beside the point. I merely wanted to make a bug report and as you can see from my uploaded screen dump, I have already resorted to this workaround you are suggesting. Thanks anyway.
I posted that answer because you entered "none" for "work around". Please keep in mind that those of us that posted a comment here are not the only ones to read them and my comment may help someone else who finds this thread when looking for a solution.
@ PhilModjunk: Of course. Thanks for reminding me.