Price can not change on it is own, unless someone else changes it. I you sure that this was not changed by some other person?
Can you please confirm this still happen?
New release will be ready in 1-2 weeks
As for stable production release (v1.0) we target end of Jan 2012.
I was earlier runing it on XAMPP and or WAMPP
Now i have it on a pure unix distribution. the store setup.
I just faced the same problem again, here is how it happened.
1. I added a product (cost : xxxxx.xx price : xxxxx.xx) (applied tax class of 5%)
2. When the cursor is taken out of the cost and price text box it automatically sets itself this way ( xx xxx.xx) notice the space.
3. I saved the product, added images, all set.. and its working fine.
4. I Edited the product, the price and cost were displayed in this format (xx,xxx.xx) i edited the cost (by reducing the price by 3k.
5. I saved it, and refreshed the product on the store front. now the price both on store front and in admin catalog is (xx.xx) and so is the cost (xx.xx)
;-)