Make sure that there are no insecure links:
* Open the browser console and check for errors.
* Check that the stylesheets and scripts are available on the site (even if the links were relative)
* Check the links in Javascript plugins and SDKs. Some will ignore the SSL and try to obtain resources from http.
* All iFrames should be https, so check that they are valid.
* Do you have a wildcard SSL? If not, the 301 redirections will not work properly.
Other things:
* Validate the SSL. If there is some warnings, it can cause errors on certain browsers.
* Check the site speed.
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