Hi,
1.6 files opened and saved with 1 .7.0.380, without any modifications, are five to eight times bigger than the original.
Example:
One jpeg image with two adjustment layers has a file size of 5.425k for version 1.6.
Opened an saved with 1.7.0.380, with no modifications, the file size is 47.299k, almost 9x bigger...!
Here is a screenshot:
Thank you and keep up the good work! :-)