I was upgrading a solution from 6.2 to 7.2 and it had a number of custom fields that no longer worked,  so I started to fix the code.

One of the custom fields showed the SPEAK  Insert link dialog and after making a lot of changes, I noticed that I had broken the SPEAK dialog, see below

I reviewed the changes I had made, and could not see what could have caused this issue? But to be on the safe side, I undid all of my changes, did a full build, etc and still I had the issue 😦

So I tried to open the dialog from a sitecore standard field, and it was also broken 😦

Solution

Whist starting to panic, after 5 minutes I noticed that the dialog had fixed itself!!!!

It appears that after a restart of the website the first time you open the “Insert link” dialog you have to wait 5 minutes for it to start working, after that it works straight away.