Vanguard has been updated to 1.7.2. You can download the update from http://www.refx.com/?lang=en&page=downloads/products.
According to this page to a post in their forum here is what's new:
- RTAS support has been removed completely. It was never officially supported by reFX and created a LOT of problems. It took us several months to implement and in the end the results where not satisfactionary. Also the demand is a lot lower than anticipated.
- Replaced the voice-stealing mechanism to avoid clicks.
- Save preset/bank dialogs have a default filename now. “.fxp”/”.fxb” gets appended automatically (if not already present).