Dear All, dear Matt, all tests were done on Macs (one M1 & one Intel) with the latest version your software & latest OS. 1. Read-In of spec files works, but only one file at once. Even if multiple files are selected 2. If one tries to load text-files it is possible to load data form multiple files as long as you don’t try to load also the reference spectra. If you load the reference also the read-in stopps at the transmission/fluorescence spectrum of the second file selected. 3. Trouble, that I sometimes can’t unmount network volumes after reading from them, larch saved on local discs. MacOS claims that python has files open; no other python program running 4. unable to save the data of one XAS-viewer while having two xas-viewer open. best regards Stefan Mangold