When did your sprint start? The red line shows up from the start of the sprint to the current date, if you have only just started the sprint you might not see it.
Also, it could be if you don't have any issues in your sprint with estimates, you might not see a red line, but in that case you wouldn't see a grey guideline either. You can check by viewing the Sprint Report the total estimates for completed and incompleted issues so far.
Wow, I got swamped and now that I've finally gotten my head back above water, I find we have several new members! Welcome @Darren Keith lowman , @Amanda Babb , @Luis Zapata , @Joli Holmes , and @bh...
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