Hi bicuit,
When you change images in your active listings, the store window image will NOT be changed so there is no reason to hold your breath waiting for that to happen. If you disagree with the store window image being displayed for a particular item, I recommend making that item hidden in your Auctiva store at Auctiva -> Store(Tab) -> Edit Store Items. Any items that are made hidden will no longer be displayed in your Auctiva store, nor will they be displayed in your store window the next time it refreshes, which it does about every 2 hours. The functionality to manually change the images being displayed in the store window is on our "to do" list for our Phase II release.
If your items have received bids and the prices have therefore increased, this information should be updated according to the following approximate schedule:
Our listing maintenance, which updates title, current price, high bidder, high bidder feedback, bid count, currency, and end time on your active listings page is done about every 6 hours.
Once your updated prices are reflected on your active listings page, they should be displayed in your store window the next time it refreshes, which it does about every 2 hours.
If you are referring to items for which you have lowered the prices on eBay, please read the following thread:
https://community.auctiva.com/eve/forums/a/tpc/f/255609321/m/5911054881
-Mike