Since it wasn't just me with this problem, I started digging around...
The latest version installs with a default Word length of 50 characters.
Hence, when a link (or photo etc) need to link somewhere, it often goes over this quantity, and the security system adds breaks to the string.
To fix it:
Backend > Component Settings > Security > word max length
you will see it is probably at 50.
If you increase this to ie. 150, that should solve it.
It did here at least.
You will also need to do this for each of your plugins, if installed.