A new release of RCO Editor is out by ZiNgA BuRgA. This time with a bug fixed from the latest version.
Heres whats new
RCO Editor v1.14b
Fixed minimize crash
RCO Editor v1.14
Minor changes/bug fixes
Should now be fully compatible with the new decompressed 3.40 RCOs
Note that the newer style GIMs support heights which aren't a multiple of 8
However, RCO Editor will require replaced images to have a height which is a multiple of 8 to preserve compatibility with older versions