I seem to have this problem more often than not. Exact same issue others have. Page loads with links and flags from the page footer, but no map......only happens if I am logged in. Once I logout I can see the map just fine.
I was having the same deal. No map after logging in. I recently created an account and I noticed that the map size under my account information was blank. This information is not asked in the original "New Account Registration" form.
I edited my account and put in a size for "Max Width Pixels" 999 "Max height pixels" 800
and it works now. Note that the form doesn't accept numbers over 999, so 1000 gets truncated to 100. The admin for this site should probably insert some default values here.
you may also want to play with the zoom number. I have mine at 5.