Trying to use the "Close All" function when the screen is split into multiple windows often leads to LyX becoming unresponsive (i.e. Windows "not responding" message). The program doesn't recover even when left for hours.
It seems to happen when there are several child documents of a large master document open in the split views and the program attempts to close them in sequence. It appears as though it starts to close them but then stops and hangs. The outline pane does some level of updating as it initially tries to close the child documents and the early chapters in the hierarchy drop out of the TOC list. Then it becomes unresponsive when anything else is done with the program. It doesn't matter whether any of the documents require saving (i.e. the same result occurs when all have already been saved). Fortunately, LyX has one of the best "fuss free" auto save and recovery processes that I have come across, so content is only lost if the auto save interval is large. A bit annoying nonetheless. This is currently happening for both LyX 2.1.2 and 2.1.3 on Windows 7 (64-bit) systems. But I do also have a feeling it was happening with 2.1.1 and possibly 2.0.x. James
