I never used a Mac, but if you want to test my files, maybe this can help you.
In Windows, when we have installed Rainlendar and the Shadow4-Widgets.r2skin-addon, we can find the Shadow4 skin (Shadow4.r2skin) in the ~/.rainlendar2/skins folder. We can make a copy of it, that we rename Shadow4Mod.zip (for example). In this way, we can unzip it.
This gives a folder in which are all the files of the skin. It contains a subfolder named 'images', another named 'scripts' and a last 'xml'.
In my files, the 'weather.lua' must be moved in the 'script' folder, 'weather.xml' in 'xml', and 'weather-bg-English.png' in 'images'.
Now, we can find this modified version of Shadow4 (named Shadow4Mod) in the Options of Rainlendar. It is considered as a new skin.
Even if this can help you, I think that it will not allow you to resolve your crashes problems. Here, I can't help you. Sorry
! (and sorry for me english, it is not my own language