Build 79 can be downloaded from here:
Windows: Rainlendar-2.5.b79.zip
Linux TAR (32-bit): Rainlendar-2.5.b79-i386.tar.bz2
Linux DEB (32-bit): rainlendar2-pro_2.5.b79-1_i386.deb
Linux TAR (64-bit): Rainlendar-2.5.b79-amd64.tar.bz2
Linux DEB (64-bit): rainlendar2-pro_2.5.b79-1_amd64.deb
Mac OS X (Intel): Rainlendar-2.5.b79.dmg

This is beta version! It has not been tested.

The addons for Shadow4 skin 1.4:

www.rainlendar.net/download/1.4/Shadow4-Widgets.r2skin-addon
www.rainlendar.net/download/1.4/Shadow4-Languages.r2skin-addon

Changes:
o The ini format skins got broken by the "hide url icons" feature. Fixed.
o Added possibility to set the info text (infotext) and focus (focus) for the edit controls from the lua api.
o All files that end with "addon.xml" are read from the skin archive and added to the skin. This makes creating the addons simpler.
o Added new setting which will draw a rectangles around skin elements: AddSkinRectangles
o Added an alternative format for the grouped multiday event header.
o Added an advanced option to download all network calendars simultaneously.
o Fixed multiple crash bugs in the Mac version.
o Added ignorefirstday and ignorelastday attributes for the weeknums element in the calendar item.
o Visual category is now applied only for events without any category. This can be changed from the advanced options.

On Mac - Weather addon doesn't crash Rainlendar anymore, but it won't take any other location than the default one. You set it, hit ok and then, when you open the weather setting again, it is again the default one This can be done with the ini file, though.

Also you can't turn off ShowTrayIcon and ShowDockIcon in the GUI anymore, when I set it to 0 in the ini, it works, though.
Also setting scale of an element doesn't crash Rainlendar anymore, but you can't set this either.
On first glance it seems that you turned off all the things that could crash Rainlendar on Mac

It looks that unless you move the focus away from the edit field the value doesn't stick. I can reproduce this with a Hackintosh installation but not with my MacBook Pro which is a bit strange. Anyway, I'll see if I can figure out why this happens.

hmm, I see, that (moving the focus away) seems to work for the Skin input fields. So what about the missing "no" field in the advanced settings? It seems that every yes/no field does not show the no in the drop down list (unless there is already a no, then both will be shown in the dropdown list), if the focus is on the field and you press n, you will get a no, though.

For reference, my sysem is an imac core2Duo 3.06GHz, with OS X 10.5.7

The 'no' is not missing it just that the list control draws itself too short so there is no room for the item in the visible area. You can use the (quite poorly visible) scroll bar or cursor keys to change the selection.

True, it's not missing and the list should be able to draw it, only it draws the "yes" and an empty field below it, instead of starting with the "no" which is at the first place in the list