I have a similar issue.. The wazers take a long time to show up after I start the program. And then they show up for only a few seconds, then disappear.
A few seconds later I get more wazers (totally different wazers), and they too only show up for a few seconds then disappear.. I have yet to see wazers driving down a road without them totally disappearing. I first thought it was my 3g/4g connection, but then I tried it at home with WiFi, and I see the same issue.
I don't have the speedometer issue you are having.. It's shows up just above the lower right report icon.
Also, I have my map set to 2D.

Hi, anybody have any ideas here as to why I dont see any other waze users on my app as I drive around?

Well, had an update yesterday, which caused the speedometer to completely disappear.....it also didnt do anything for the wazers.....I get messages to say how many there are but none appear. What updates appeared this time?

I have the same issue with the speed being hidden by the lower right button on my S4. In general, the screen placement of icons seem a little off with the S4.

Please search before posting - The Issue with the speedometer is fixed in the latest release and is currently going through beta testing.

With regards to wazers not showing up - i believe that Waze have been fiddling with the settings for number of wazers shown and are still working on this - perhaps a champ can confirm.