There is definitely a maximum on either the amount of placemarks or data a map can handle. I made another category and as soon as I loaded more than about 2200 to 2500 placemarks to the category the map stopped displaying
http://www.solarmaxtech.com/about-us/installation-map/
I pasted the different codes I have used below. What is weird is that when I noticed the map was no longer working I tried to use a longer code calling out the details and that worked. Now it’s later in the day and the code with details has stopped working as well. Pretty weird.
[bgmp-map]
[bgmp-map categories="placemarks" width="850" height="650"]
[bgmp-map categories="placemarks" width="850" height="650" type="hybrid"]