Please, note that the bumps floater only lists the *last* bump registered for each given bumping avatar, and that it is not automatically refreshed when left open: you need to close it and reopen it to see new bumps updated (with new time for bumps from the same avatar) or added. I just checked and it works perfectly this way.
I did not update the bump floater code since the v1.18 viewer era (back in 2007), so the changes implemented since by LL (probably in their v2 viewer) have not yet been backported to it...
Note also that, nonetheless, the Cool VL Viewer implements a (real time) Lua callback for push and hits and you can use it to warn you at each such bump. See the
Lua scripting and viewer automation feature documentation for OnAgentPush(), with
an example of its usage in the automation script.
So, not a bug, and I am moving this thread to where it belongs, in the feature requests forum.