I have taken a look at your pages and can confirm that I can edit the instances that you have on these pages without any crashing or other issues. This leads me to believe that there may be an issue with your cache file or current installation files. In the link that Office Guy posted are steps to delete this cache file as well as renaming the configuration folder if you need to.
We have a document on deleting the cache file here:
Also, if this does not work for you here is a link to steps you can take to rename your configuration folder:
Please give these things a try to see if you can get past this issue. If you have any trouble with any of this or have any questions please let us know.