It seems that there have been problems with IE 11 with some sites. I may know of a possible solution.
First, you will need to clear your cache on IE 11. The most effective way to do this is to close all browsers, then click on your ‘Start’ button and select ‘Control Panel.’ In the Control Panel, select ‘Internet Options.’ Remaining in the ‘General’ tab, select ‘delete’ under the browsing history heading. Make sure all of the option boxes are selected with the exception of the first option of ‘Preserve Favorites website data’. Finally, select ‘delete’ and wait for the process to finish.
Once that is done, open IE 11 and select the ‘Tools’ menu. There should be an option that says ‘Compatibility View settings.’ Click on that, and add https://3dwarehouse.sketchup.com to the site list. You will notice that it will only add the actual domain of sketchup.com. Close your browser and re-open it. That should allow the page to be loaded. It worked for me.
If this doesn’t work, please feel free to contact me. I am happy to help.