Poser 11 Pro was working fine yesterday, then a power issue crashed my system (I'm still using Big Sur on an Intel iMac). Poser 11 will not launch.  I reinstalled Poser, but no dice. I assume some key preference files got corrupted. What pref files should I delete t or recover from Time Machine o enable launch? Thanks for any help!

Try your luck with those files:

- Poser UI PrefMap.xml
- AddonPrefs.json
- LibraryState.xml
- LibraryPrefs.xml

I frankly doubt that both Library...xml have any influence in the crash you're experimenting, I would first check the first one: it contains where each window/toolbox is and its floating state. When this file is lost, Poser reverts to its default UI. and when the UI is correctly set, it's a good idea to keep a copy.

I am using Poser with Windows, so that I ignore where the Mac is keeping them, probably somewhere in the library, applications data (if I remember correctly, when the Option key to push when the Finder is opened, this adds/replace a location in the "Go to..." menu entry (my Mac is in French so that it's something like that)

It could also be a problem wit h Poser.ini

Mine is in C:\Users\bill\AppData\Roaming\Poser Pro\11

try renaming, if it does not exist, it will creat a new one.

other than thattry a diskkcheck on your computer and see if there  are any damaged files

Bill

Thanks for the suggestions. I seem to remember that there is a hidden startup file that you have to get to using Terminal, but I haven't found the thread on that yet.

Not sure there's a hidden file, but there's one that, when present, is automatically loaded: "preferredState.pz3". Delete it to retrieve Poser 11's default scene.
Look here: "Macintosh > Users > your_user > Library > Application Support > Poser Pro > 11

You may arrive here using the finder's menu "Go to" (I think) while pressing the Option key

Thanks, Y-Phil! I'll try that..... Nope!