Observatory 2.0.1 fixes the “System is critically low on memory” alert a few users were reporting. This alert was implemented all the way back in Observatory 1.1 and intended for systems with a harddisk as their main storage device. Observatory 2 uses significantly less memory than Observatory 1.x and this alert is now obsolete, hence it has been removed.
There’s also a new “STF type” option in the General Settings for changing the default STF used by the canvas, thumbnails, exporting and sharing. This is useful if you only have processed images in your libraries.
Other changes can be found in the release notes.