UPDATE: Google Maps has issue with slow loading maps — not showing markers.
Here’s a problem that affects all browsers. Embedded maps load slow, or their markers and line routes do not show. If you click to view the map directly from maps.google.com, you might see the following message …
Are you getting this message?
Still loading… Slow? Use the troubleshooting guide or basic HTML

Usually a simple refresh of the browser will display the markers in either the embedded map of the map on maps.google.com

FIX: Google Maps Won’t Load in Microsoft Internet Explorer
Many websites use embedded maps from Google for enhanced content in articles. Unfortunately, users report difficulty while using Microsoft Internet Explorer because embedded maps do not display on a web page. The simplest solution might be to exit Internet Explorer and use Firefox (firefox.com), Safari (apple.com/safari) or Chrome (google.com/chrome) to view these websites. These browsers are more likely to function without any complicated changes in settings necessary.

If you still wish to use Microsoft Internet Explorer, you may try the following steps to view the maps on web pages:

THE EASY WAY:
1. First try a RIGHT CLICK of the mouse over the blank area where the map is placed.
2. Next, select REFRESH from the pop-up menu.

If the map displays, that’s it, you are ready to go. However, you will have to repeat this RIGHT CLICK step for every page that you view.

NOTE: This EASY WAY procedure may not work at public computers or kiosks where the RIGHT CLICK has been disabled. Also, the following more difficult procedure (THE HARD WAY) will not be available at public computers or kiosks.

THE HARD WAY:
If the easy RIGHT CLICK procedure doesn’t work, you may have to adjust your security settings for Microsoft Internet Explorer. After you adjust the settings as described below, you should see the map when the page loads. If you still don’t see the map load, you still may have to use THE EASY WAY technique mentioned above for each page that you want to view. (REMINDER: You might want to just use Firefox (firefox.com), Safari (apple.com/safari) or Chrome (google.com/chrome) … Do you still want to use Microsoft Internet Explorer?) Continue below …

If you’re having trouble using Google Maps with your Microsoft Internet Explorer browser, please try the following steps recommended from Google Help to see if the problem is resolved:

Clear the Internet Explorer browser’s cache

Clearing your browser’s cache may resolve the problem you’re experiencing. To do so in Internet Explorer 6.0 or later version:

1. Open IE and click Tools.
2. Select Internet Options.
3. Click General, if it isn’t already selected.
4. Click Delete Files … under the heading ‘Temporary Internet files.’
5. Click OK to exit.

Make sure JavaScript, ActiveX, and ‘binary behaviors’ are enabled

To enable these browser settings in IE:

1. Click Tools > Internet Options.
2. Click the Security tab.
3. Click the Custom Level button.
4. Verify that the Enable button next to ‘Run ActiveX controls and plug-in’ is selected.
5. If you’re using XP, verify that the Enable button next to Binary and script behaviors is selected. If you’re not using XP, continue to step six.
6. Verify that the Enable button under ‘Active scripting’ is selected.
7. Click OK, then click OK again to save your changes.

The easiest and safest way to enable Google’s maps in your browser is to add Google Maps to your list of trusted sites in Internet Explorer. Here’s how:

1. Click Tools > Internet Options.
2. Click the Security tab.
3. Select the ‘Trusted sites’ icon, and click the Sites button.
4. Deselect the option ‘Require server verification for all sites in this zone.’
5. In the text field ‘Add this Web site to the zone:,’ type ‘maps.google.com‘ (without quotes) and click Add.
6. Repeat step five for ‘local.google.com,’ ‘www.google.com,’ and ‘*.google.com.’
7. Click OK, then click OK again to save your changes.

Google Maps takes advantage of several advanced browser features. If your browser appears not to load the map properly, you may need to update your scripting engine. You can obtain the latest scripting engine directly from Microsoft:

Update the ’scripting engine’ of your system

For Windows XP and 2000:
http://www.microsoft.com/downloads/details.aspx?
FamilyId=C717D943-7E4B-4622-86EB-95A22B832CAA&displaylang=en

You’ll probably need to restart your system after performing this update. Then, try Maps again to confirm that this step resolved your problem. Otherwise, try the next step.

Install the latest version of DirectX

Some IE users have reported that installing the latest version (9.0c) of DirectX has resolved the difficulties they’ve experienced viewing maps. To install DirectX, please visit http://www.microsoft.com/windows/directx/default.aspx

Check for security settings or browser plug-ins

Some security programs and third-party browser plug-ins are designed to modify webpage content and may interfere with the map display. If applicable, please try temporarily disabling components that may disable our maps in your browser.

SOURCE (settings details for Microsoft Internet Explorer from Google):
GOOGLE SUPPORT — Maps Help Center
“I’m experiencing difficulty viewing the maps while using Microsoft Internet Explorer. How do I fix this?“

SEE ALSO …
Google maps won’t load in Firefox 3 or IExplorer

PLEASE NOTE:
AA-ER.COM has made several attempts to use html and javascript code that will automatically refresh the iframe that is used for embedded maps, but no solution has found that works to automatically display maps in Internet Explorer.

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RESOURCES:
Google Maps Forum: Google maps UI painfully slow after latest revision