I'm glad you brought this topic up. This has been a problem in my trying to get showeq to run on an uptodate linux install. It's very weird, as you described. It loads ok, but the data is intermittent, with no real way to force an update, it just sometimes does it. I tried putting in older versions of libpcap and that didn't help.
But cn187's patch to that part of showeq works. I now have it running no problem on Ubuntu 19.10. I can post some instructions on how I got it to go if anyone's interested.
So thanks you guys, this has been bugging me for months! Not that there's anything wrong with Centos, but it's nice not to have to reboot just for the one program, hehe.
*edit* maybe this should just be merged into the main release? Doesn't seem like it would hurt anything.