[odamizu]

ETA: See post #12 below

Thanks Kevin. I think there must be something weird about my Mac (10.13.6), or maybe it's my dual-monitor set-up, as Sigil is not behaving the way you're describing (unless I'm not understanding you, which is possible, as this is all a bit above my head).

In any case, I have the windows happily where I want them to be. I am not reporting a bug. But in case this is of interest to you or anyone else, this is what I've tried:

1) Install Sigil 0.9.13 with Sigil 0.9.10 preferences already in User > Library > Application Support > sigil-ebook > sigil. When 0.9.13 opens the first time, the window is in default size/position. I re-size and re-position it, then close the window and quit Sigil. When I re-open Sigil, the window is back to default position. I open and re-size/re-position more windows, closing and quitting several times, but every time I re-start Sigil, the window is back to default size/position.

2) I quit Sigil, delete all preference files and do a clean install of Sigil 0.9.13. When 0.9.13 opens the first time, the window is in default size/position. I re-size/re-position it and close the window. I do not quit Sigil. Instead, I open a new file, and the window is re-sized and re-positioned exactly where I want it to be. Perfect!

3) I quit Sigil, delete all preference files and copy over preference files from 0.9.10. I open sigil.ini and delete everything except [shortcuts] and [user_preferences]. When 0.9.13 opens the first time, the window is in default size/position. I re-size/re-position it and close the window. I do not quit Sigil. Instead, I open a new file, and the window is re-sized and re-positioned exactly where I want it to be. Perfect!

Thank you for all the time and energy you put into maintaining Sigil and providing support to simple-minded users like me