Walls wont blow up

Suddenly I am unable to C4 walls on the Server or chop them out, they just turn black but don’t blow up, is this a glitch or some setting?

How many charges did you use?
And no, you can’t chop walls.

Do the charges vanish after exploding or are they still there?
The walls turn black? How many c4 did you attach to the wall?

20 At least to the wall.

Perhaps a modded server?

im interested in this too. happened to me the other day on a server. Admin didnt know why it wouldnt blow either. i was trying to blow a wood doorway and used at least 20 C4. did the same on a wooden door.

[editline]3rd March 2014[/editline]

to clarify, tried pickaxing he wooden door first