Sometimes, I click the mouse button just after I died since I tried to shoot an enemy tank. Then I switched automatically to an other friendly tank watching his play and at the same time he damage log disappears. But since I am interested in who has shoot me, I have to click on me to see the damage log again.
A small setting prevents the damage log to disappear:
In the config file
...\res_mods\configs\DamageLog\Log.cfg
change the setting from
"showPostmortem" : false, to
"showPostmortem" : true, and now the damage log does not disappear anymore.
If you like this behavior too, maybe you could preset this setting in your mod-pack.