When I go to inspect someone, nothing happens. It's possible, but rarely does it work on the first try. I click inspect about 4 times and then the inpect window pops up. I've tried disabling the elvUI character pane and inspect skin, but it doesn't help.
You'd be best to go on over to www.tukui.org and report the problem in the ElvUI part of the forums, you'll most definitely get more help there than here, seeing that's probably the forums the addon author checks the most.