Hello,
When you open my replay "Sign_Bug_2015_08_30_17_19_52_e", hit t, click on the timeline to 00:55, hit b, click on HvMythenmetz, hit t and then click on the timeline to 00:40, you don't see signs but a red wall. If you play the replay without these instructions and simply spectate HvMythenmetz from the beginning, you see the signs.
Regards,
Mythenmetz