We've implemented a folder watch trick to update cached images whenever they change. This will help to ease editing and on-the-fly changes to your SensorPanel layout. Make sure to upgrade to the latest beta version of AIDA64 Extreme available at:
https://www.aida64.com/downloads/latesta64xebeta
Make sure to leave the Cache Image checkbox checked (enabled). If it works out for both images and custom gauge states, we will remove the Cache Image option.