I am using XF 1.0.1 on 2 sites, both have the same problem with the 24 hr clock format.
If a post/thread/activity is made at 14.10, the last 0 does not show up.
14.13 etc show up ok.
This happens with the Taigachat chat view too.
My site is at:
Attached are a few picture examples, 3 problems and the last one with an all ok clock (22.33) view.