I can't seem to get my markers to come up in the Gmap module - I've changed permissions, I've checked the gmap_markers.js file, etc.
The map itself comes up, but I can't get any markers to appear.
What could cause this?
Could it be permission settings on my /default/files directory?
This question is obviously very old, but I spent the last few hours figuring out the same issue and figured this might help someone else who is Googling this problem.
The problem for me was this:
In Modules, "Location Entity" should NOT be enabled. "Location CCK" (in the Fields section) should be.
Then, when modifying the Content Types, do NOT rely on the "Location" field that is there by default (machine name = locations). You have to add your own, additional Location field (field type = Location; widget = Location Field).
This solved the problem for me. I created a View (Page) for a Specific Content Type with Format = GMap and Data Source = Location.module.
Then it finally worked! Hope this helps.
I looked everywhere for a way to fix this issue for me, and none of the answers I found worked. So I thought I'd post my solution here, in case it might help someone else in future. My problem was simply that I had the theme_debug variable set to 1. As soon as I turned theme debug back off, all my markers worked again! With drush you can just do (in Drupal 7) "drush vset theme_debug 0". That fixed my issue!
